Condor Gold (AIM: CNR; TSX: COG) is pleased to announce that it has
received the final results of metallurgical tests for a Feasibility
Study (FS) being conducted on the La India Open Pit from Bureau
Veritas Laboratories in Richmond, British Columbia. The most recent
iteration of testing was focused on variability testing and
confirmation of recoveries at the lower grades. The 2022 FS Study
(the “FS” or “Feasibility Study”) will bring the level of
confidence for the Project to the industry-standard of engineering
design, sufficient to support +/- 15% capital and operating cost
estimates.
Highlights of Feasibility Study Metallurgical Test
Results
- The confirmatory
testwork demonstrated that gold recovery is independent of grade
and a fixed gold recovery of 91% assuming a 75 micron grind size
will be used in the project economics of the forthcoming
Feasibility Study.
- Gold extraction
from the 11 variability composites averaged 92.6% at the 75 micron
grind size, which is reduced by 2% to allow for gold being locked
up in the processing plant.
- Gold extraction
from the four low grade composites averaged 93.8% at the 75 micron
target grind, indicating a gold recovery of 91.8% after a 2%
reduction to allow for gold being locked up in the processing
plant.
- At a finer grind
size of 53 microns an average gold extraction of 94.7% was
achieved, indicating a potential upside gold recovery of about
93%.
- The selection of
the composites by both grade and approximate year of production
provides confirmation that the mill recovery will not be materially
affected over the life of the La India Mine.
Mark Child, Chairman and Chief Executive of Condor Gold,
commented:
“I am delighted that a net metallurgical
recovery of 91% will be used in the technical economic models for
the forthcoming Feasibility Study on the La India Open pit. Very
comprehensive metallurgical test-work has been conducted to the
highest standards as a Feasibility Study level is the technical
document to which project finance is provided to the Project. 91%
metallurgical recovery over the life of mine is a terrific result
and represents a significant de-risking of one of the most
important variables in the development of a new mine at La India
Project and provides significant comfort to investors.
The application of both variability testing and
confirmation of low-grade responses is consistent with best
practices in the mining industry, while confirming the ability of
the processing plant to achieve excellent recoveries down into the
lower grade portions of the deposit, in a standard Carbon-in-Pulp
cyanidation plant.
The higher gold recovery at 53 micron-grinds
suggests an opportunity to recover an additional 2% of the
contained gold from the La India material”.
Background
During August of 2021 in preparation for the FS,
Condor assembled eleven further variability composites from La
India Open Pit, testing high grade, medium grade and low-grade
composites as well as composites selected to represent individual
phases and production years. Additional composites were selected to
test responses of the lower grade ores (below 1.5 g/t Au) to ensure
that the recovery parameters previously applied were valid at the
lower grade ranges. This work was conducted by Bureau Veritas
Laboratories (BV) in Richmond, British Columbia.
Discussion – Leaching Studies
The 2022 studies were conducted as a
confirmation and check of earlier leaching test results obtained in
December 2021, and to extend Condor’s understanding of the response
of the mineralized material at smaller grind sizes and lower grade
ranges.
The variability test results are summarized
below in Table 1.
Condor notes that the results of the current BV
results are consistent with the results from the PFS study in 2014,
which indicated a fixed gold recovery of 91%. It is notable that
the current design parameters at a 75 micron grind support a total
retention time of 48 hours versus the 30-hour retention time
nominated in the PFS.
Table 1: Summary of Leach Test Results for 2022 Bureau
Veritas – 11 Variability Composites
100 Micron Summary - 11 Variability
Composites |
|
|
|
|
|
Sample ID |
Actual P80 Size |
Measured Head* |
Calculated Head |
48h Extraction |
μm |
Au (g/t) |
Ag (g/t) |
Au (g/t) |
Ag (g/t) |
Au (%) |
Ag (%) |
High Grade Var Comp |
103 |
5.16 |
12.67 |
5.43 |
14.20 |
88.74 |
64.79 |
Medium Grade Var Comp |
99 |
1.76 |
9.00 |
2.29 |
9.33 |
87.65 |
57.11 |
Low Grade Var Comp |
99 |
0.89 |
4.00 |
1.18 |
3.89 |
91.72 |
48.65 |
Starter Pit North Var Comp |
98 |
1.84 |
10.33 |
2.77 |
10.01 |
90.32 |
60.03 |
Starter Pit South Var Comp |
101 |
2.95 |
12.67 |
3.92 |
13.63 |
87.30 |
63.32 |
Phase 2 - Year 4 Var Comp |
98 |
3.44 |
10.33 |
4.85 |
11.23 |
92.00 |
64.38 |
Phase 2 - Year 5 Var Comp |
101 |
4.32 |
7.67 |
4.93 |
8.29 |
91.25 |
63.82 |
Phase 2 - Year 6 Var Comp |
105 |
5.25 |
7.00 |
6.10 |
7.13 |
90.58 |
57.95 |
Phase 3 - Year 6 Var Comp |
102 |
1.92 |
5.00 |
2.25 |
6.03 |
90.58 |
50.22 |
Phase 3 - Year 7 Var Comp |
98 |
1.90 |
4.00 |
2.48 |
4.27 |
91.21 |
53.16 |
Phase 3 - Year 8 Var Comp |
99 |
2.65 |
6.00 |
3.58 |
5.49 |
91.73 |
63.59 |
|
|
|
|
|
|
|
|
Average |
100 |
2.92 |
8.06 |
3.62 |
8.50 |
90.28 |
58.82 |
|
|
|
|
|
|
|
|
75 Micron Summary - 11 Variability Composites |
|
|
|
|
|
Sample ID |
Actual P80 Size |
Measured Head* |
Calculated Head |
48h Extraction |
μm |
Au (g/t) |
Ag (g/t) |
Au (g/t) |
Ag (g/t) |
Au (%) |
Ag (%) |
High Grade Var Comp |
75 |
5.16 |
12.67 |
5.35 |
13.43 |
92.64 |
70.21 |
Medium Grade Var Comp |
73 |
1.76 |
9.00 |
2.32 |
12.87 |
90.42 |
45.61 |
Low Grade Var Comp |
74 |
0.89 |
4.00 |
1.11 |
3.99 |
93.79 |
49.82 |
Starter Pit North Var Comp |
73 |
1.84 |
10.33 |
2.84 |
11.51 |
94.03 |
65.25 |
Starter Pit South Var Comp |
73 |
2.95 |
12.67 |
3.83 |
14.07 |
89.93 |
64.47 |
Phase 2 - Year 4 Var Comp |
73 |
3.44 |
10.33 |
4.16 |
10.79 |
94.10 |
62.93 |
Phase 2 - Year 5 Var Comp |
72 |
4.32 |
7.67 |
4.86 |
8.21 |
92.37 |
63.46 |
Phase 2 - Year 6 Var Comp |
72 |
5.25 |
7.00 |
6.13 |
7.55 |
92.46 |
60.26 |
Phase 3 - Year 6 Var Comp |
78 |
1.92 |
5.00 |
2.17 |
5.30 |
93.01 |
62.27 |
Phase 3 - Year 7 Var Comp |
78 |
1.90 |
4.00 |
2.54 |
4.29 |
93.07 |
53.34 |
Phase 3 - Year 8 Var Comp |
77 |
2.65 |
6.00 |
3.70 |
5.76 |
93.54 |
65.29 |
|
|
|
|
|
|
|
|
Average |
74 |
2.94 |
8.27 |
3.53 |
9.20 |
92.58 |
59.76 |
|
|
|
|
|
|
|
|
53 Micron Summary - 11 Variability Composites |
|
|
|
|
|
Sample ID |
Actual P80 Size |
Measured Head* |
Calculated Head |
48h Extraction |
μm |
Au (g/t) |
Ag (g/t) |
Au (g/t) |
Ag (g/t) |
Au (%) |
Ag (%) |
High Grade Var Comp |
54 |
5.16 |
12.67 |
5.61 |
13.11 |
94.57 |
77.11 |
Medium Grade Var Comp |
68 |
1.76 |
9.00 |
2.28 |
7.90 |
91.63 |
74.67 |
Low Grade Var Comp |
55 |
0.89 |
4.00 |
1.15 |
4.13 |
95.96 |
51.58 |
Starter Pit North Var Comp |
52 |
1.84 |
10.33 |
3.04 |
10.99 |
95.37 |
72.70 |
Starter Pit South Var Comp |
52 |
2.95 |
12.67 |
3.87 |
13.82 |
93.55 |
71.07 |
Phase 2 - Year 4 Var Comp |
54 |
3.44 |
10.33 |
4.22 |
10.32 |
95.62 |
70.94 |
Phase 2 - Year 5 Var Comp |
54 |
4.32 |
7.67 |
4.60 |
7.57 |
95.53 |
73.60 |
Phase 2 - Year 6 Var Comp |
52 |
5.25 |
7.00 |
6.02 |
7.61 |
95.12 |
60.56 |
Phase 3 - Year 6 Var Comp |
55 |
1.92 |
5.00 |
2.15 |
5.38 |
94.83 |
62.85 |
Phase 3 - Year 7 Var Comp |
54 |
1.90 |
4.00 |
2.64 |
4.49 |
95.64 |
55.43 |
Phase 3 - Year 8 Var Comp |
56 |
2.65 |
6.00 |
3.59 |
5.84 |
95.19 |
65.77 |
|
|
|
|
|
|
|
|
Average |
55 |
3.06 |
8.74 |
3.66 |
8.98 |
94.69 |
68.34 |
* Measured Head is determined prior to the leach
testing as determined from a split of the initial sample.
Calculated head is based on the sum of the assays of both the leach
solutions and of the residue. Calculated head is considered the
more reliable measure of the contained gold and recovery.
Condor and its consultants also recognized the
lack of metallurgical testing at the lower grade ranges,
particularly at the break-even and marginal cutoff ranges. While
not a significant contributor to overall project economics, the
stockpiling of low and even sub-grade material offers the
opportunity for capturing additional ounces at the end of mine-
life. This recognition initiated the secondary investigation on the
low-grade material.
The results of the low-grade investigations are
presented in Table 2 below:
Table 2: Low Grade Recovery at 75 micron
Low Grade Composites - 75 micron target grind |
|
|
|
|
|
Sample ID |
Actual P80 Size |
Measured Head* |
Calculated Head |
48h Extraction |
μm |
Au (g/t) |
Ag (g/t) |
Au (g/t) |
Ag (g/t) |
Au (%) |
Ag (%) |
Condor 0.5 |
78 |
0.48 |
3.00 |
0.59 |
3.10 |
93.49 |
35.53 |
Condor 0.75 |
82 |
0.74 |
3.00 |
0.86 |
3.75 |
94.96 |
46.66 |
Condor 1.5 |
78 |
1.23 |
4.67 |
1.55 |
4.97 |
93.08 |
59.79 |
Condor 2.0 |
70 |
1.81 |
6.00 |
2.32 |
5.65 |
93.48 |
64.58 |
Average response |
77 |
1.06 |
4.17 |
1.33 |
4.37 |
93.75 |
51.64 |
For further information please visit www.condorgold.com or
contact:
Condor Gold plc |
Mark Child, Chairman and CEO+44 (0) 20 7493 2784 |
|
|
Beaumont Cornish Limited |
Roland Cornish and James Biddle+44 (0) 20 7628 3396 |
|
|
Numis Securities Limited |
John Prior and James Black+44 (0) 20 7260 1000 |
|
|
BlytheRay |
Tim Blythe, and Megan Ray+44 (0) 20 7138 3204 |
About Condor Gold plc:
Condor Gold plc was admitted to AIM in May 2006
and dual listed on the TSX in January 2018. The Company is a gold
exploration and development company with a focus on Nicaragua.
On 25 October 2021 Condor announced the filing
of a Preliminary Economic Assessment Technical Report (“PEA”) for
its La India Project, Nicaragua on SEDAR https://www.sedar.com. The
highlight of the technical study is a post-tax, post upfront
capital expenditure NPV of US$418 million, with an IRR of 54% and
12 month pay-back period, assuming a US$1,700 per oz gold price,
with average annual production of 150,000 oz gold per annum for the
initial 9 years of gold production. The open pit mine schedules
have been optimised from designed pits, bringing higher grade gold
forward resulting in average annual production of 157,000 oz gold
in the first 2 years from open pit material and underground mining
funded out of cashflow.
In August 2018, the Company announced that the
Ministry of the Environment in Nicaragua had granted the
Environmental Permit (“EP”) for the development, construction and
operation of a processing plant with capacity to process up to
2,800 tonnes per day at its wholly-owned La India gold Project (“La
India Project”). The EP is considered the master permit for mining
operations in Nicaragua. Condor has purchased a new SAG Mill, which
has mainly arrived in Nicaragua. Site clearance and preparation is
at an advanced stage.
Environmental Permits were granted in April and
May 2020 for the Mestiza and America open pits respectively, both
located close to La India. The Mestiza open pit hosts 92 Kt at a
grade of 12.1 g/t gold (36,000 oz contained gold) in the Indicated
Mineral Resource category and 341 Kt at a grade of 7.7 g/t gold
(85,000 oz contained gold) in the Inferred Mineral Resource
category. The America open pit hosts 114 Kt at a grade of 8.1 g/t
gold (30,000 oz) in the Indicated Mineral Resource category and 677
Kt at a grade of 3.1 g/t gold (67,000 oz) in the Inferred Mineral
Resource category. Following the permitting of the Mestiza and
America open pits, together with the La India Open Pit Condor has
1.12 M oz gold open pit Mineral Resources permitted for
extraction.
Disclaimer
Neither the contents of the Company's website
nor the contents of any website accessible from hyperlinks on the
Company's website (or any other website) is incorporated into, or
forms part of, this announcement.
Qualified Persons
The technical review of the SGS metallurgical
results has been conducted by Eric Olin, a principal consultant
with SRK Consulting (U.S. Inc., who is a registered member of SME
and a “qualified person” as defined by NI 43-101. Mr. Olin has over
40 years’ experience in extractive metallurgy including extensive
experience with CIP and CIL gold extraction plants. Eric Olin is a
full time employee of SRK Consulting (U.S.) Inc., an independent
consultancy, and has sufficient experience which is relevant to the
style of mineralization and type of deposit under consideration.
Eric Olin consents to the inclusion in the announcement of the
matters based on their information in the form and context in which
is appears and confirms that this information is accurate and not
false or misleading.
The technical and scientific information in this
press release has been reviewed, verified and approved by Gerald D.
Crawford, P.E. who is a “qualified person” as defined by NI
43-101.
Technical Information
Certain disclosure contained in this news
release of a scientific or technical nature has been summarised or
extracted from the technical report entitled “Technical Report on
the La India Gold Project, Nicaragua, October 2021”, dated October
22, 2021 with an effective date of September 9, 2021 (the
“Technical Report”), prepared in accordance with NI 43-101. The
Qualified Persons responsible for the Technical Report are Dr Tim
Lucks of SRK Consulting (UK) Limited, and Mr Fernando Rodrigues, Mr
Stephen Taylor and Mr Ben Parsons of SRK Consulting (U.S.) Inc. Mr
Parsons assumes responsibility for the MRE, Mr Rodrigues the open
pit mining aspects, Mr Taylor the underground mining aspects and Dr
Lucks for the oversight of the remaining technical disciplines and
compilation of the report.
Forward Looking Statements
All statements in this press release, other than
statements of historical fact, are ‘forward- looking information’
with respect to the Company within the meaning of applicable
securities laws, including statements with respect to: the Mineral
Resources, Mineral Reserves and future production rates and plans
at the La India Project. Forward-looking information is often, but
not always, identified by the use of words such as: "seek",
"anticipate", "plan", "continue", “strategies”, “estimate”,
"expect", "project", "predict", "potential", "targeting",
"intends", "believe", "potential", “could”, “might”, “will” and
similar expressions. Forward-looking information is not a guarantee
of future performance and is based upon a number of estimates and
assumptions of management at the date the statements are made
including, among others, assumptions regarding: future commodity
prices and royalty regimes; availability of skilled labour; timing
and amount of capital expenditures; future currency exchange and
interest rates; the impact of increasing competition; general
conditions in economic and financial markets; availability of
drilling and related equipment; effects of regulation by
governmental agencies; the receipt of required permits; royalty
rates; future tax rates; future operating costs; availability of
future sources of funding; ability to obtain financing and
assumptions underlying estimates related to adjusted funds from
operations. Many assumptions are based on factors and events that
are not within the control of the Company and there is no assurance
they will prove to be correct.
Such forward-looking information involves known
and unknown risks, which may cause the actual results to be
materially different from any future results expressed or implied
by such forward-looking information, including, risks related to:
mineral exploration, development and operating risks;
estimation of mineralisation, resources and reserves;
environmental, health and safety regulations of the resource
industry; competitive conditions; operational risks; liquidity and
financing risks; funding risk; exploration costs; uninsurable
risks; conflicts of interest; risks of operating in Nicaragua;
government policy changes; ownership risks; permitting and
licensing risks; artisanal miners and community relations;
difficulty in enforcement of judgments; market conditions; stress
in the global economy; current global financial condition; exchange
rate and currency risks; commodity prices; reliance on key
personnel; dilution risk; payment of dividends; as well as those
factors discussed under the heading “Risk Factors” in the Company’s
annual information form for the fiscal year ended December 31, 2018
dated March 22, 2019, available under the Company’s SEDAR profile
at www.sedar.com.
Although the Company has attempted to identify
important factors that could cause actual actions, events or
results to differ materially from those described in
forward-looking information, there may be other factors that cause
actions, events or results not to be as anticipated, estimated or
intended. There can be no assurance that such information will
prove to be accurate as actual results and future events could
differ materially from those anticipated in such statements. The
Company disclaims any intention or obligation to update or revise
any forward-looking information, whether as a result of new
information, future events or otherwise unless required by law.
Technical Glossary
Abrasion IndexThe Bond Abrasion
Test determines the Abrasion Index, which is used to determine
steel media and liner wear in crushers, rod mills, and ball mills.
Bond developed correlations based on the wear rate in pounds of
metal wear/kWh of energy used in the comminution process. Higher
values indicate more abrasive rock.
Calculated HeadCalculated Head
is an assay determined following the metallurgical leach testing
and is based on the sum of the assays of both the leach solutions
and of the residue, and is considered the more reliable measure of
the contained gold and recovery (as compared to the Measured
Head).
Carbon-in-Pulp (CIP) or Carbon in Leach
(CIL)A metallurgical process for extracting gold by
leaching gold from the pulverized host rock with a cyanide
solution. Gold is subsequently adsorbed onto activated charcoal for
later recovery.
Measured HeadMeasured Head is
an assay determined prior to the metallurgical leach testing as
determined from a split of the initial sample to be subjected to a
leach test. It may vary from the calculated head. Calculated head
is based on the sum of the assays of both the leach solutions and
of the residue, and is considered the more reliable measure of the
contained gold and recovery.
Mineral ResourceMineral
Resources are sub-divided, in order of increasing geological
confidence, into Inferred, Indicated and Measured categories. An
Inferred Mineral Resource has a lower level of confidence than that
applied to an Indicated Mineral Resource. An Indicated Mineral
Resource has a higher level of confidence than an Inferred Mineral
Resource but has a lower level of confidence than a Measured
Mineral Resource.
A Mineral Resource is a concentration or
occurrence of solid material of economic interest in or on the
Earth’s crust in such form, grade or quality and quantity that
there are reasonable prospects for eventual economic
extraction.
The location, quantity, grade or quality,
continuity and other geological characteristics of a Mineral
Resource are known, estimated or interpreted from specific
geological evidence and knowledge, including sampling.
Material of economic interest refers to
diamonds, natural solid inorganic material, or natural solid
fossilized organic material including base and precious metals,
coal, and industrial minerals.
The term Mineral Resource covers mineralization
and natural material of intrinsic economic interest which has been
identified and estimated through exploration and sampling and
within which Mineral Reserves may subsequently be defined by the
consideration and application of Modifying Factors. The phrase
‘reasonable prospects for eventual economic extraction’ implies a
judgment by the Qualified Person in respect of the technical and
economic factors likely to influence the prospect of economic
extraction. The Qualified Person should consider and clearly state
the basis for determining that the material has reasonable
prospects for eventual economic extraction. Assumptions should
include estimates of cutoff grade and geological continuity at the
selected cut-off, metallurgical recovery, smelter payments,
commodity price or product value, mining and processing method and
mining, processing and general and administrative costs. The
Qualified Person should state if the assessment is based on any
direct evidence and testing.
Interpretation of the word ‘eventual’ in this
context may vary depending on the commodity or mineral involved.
For example, for some coal, iron, potash deposits and other bulk
minerals or commodities, it may be reasonable to envisage ‘eventual
economic extraction’ as covering time periods in excess of 50
years. However, for many gold deposits, application of the concept
would normally be restricted to perhaps 10 to 15 years, and
frequently to much shorter periods of time.
Inferred Mineral ResourceAn
Inferred Mineral Resource is that part of a Mineral Resource for
which quantity and grade or quality are estimated on the basis of
limited geological evidence and sampling. Geological evidence is
sufficient to imply but not verify geological and grade or quality
continuity.
An Inferred Mineral Resource has a lower level
of confidence than that applying to an Indicated Mineral Resource
and must not be converted to a Mineral Reserve. It is reasonably
expected that the majority of Inferred Mineral Resources could be
upgraded to Indicated Mineral Resources with continued
exploration.
An Inferred Mineral Resource is based on limited
information and sampling gathered through appropriate sampling
techniques from locations such as outcrops, trenches, pits,
workings and drill holes. Inferred Mineral Resources must not be
included in the economic analysis, production schedules, or
estimated mine life in publicly disclosed Pre- Feasibility or
Feasibility Studies, or in the Life of Mine plans and cash flow
models of developed mines. Inferred Mineral Resources can only be
used in economic studies as provided under NI 43-101.
There may be circumstances, where appropriate
sampling, testing, and other measurements are sufficient to
demonstrate data integrity, geological and grade/quality continuity
of a Measured or Indicated Mineral Resource, however, quality
assurance and quality control, or other information may not meet
all industry norms for the disclosure of an Indicated or Measured
Mineral Resource. Under these circumstances, it may be reasonable
for the Qualified Person to report an Inferred Mineral Resource if
the Qualified Person has taken steps to verify the information
meets the requirements of an Inferred Mineral Resource.
Indicated Mineral ResourceAn
Indicated Mineral Resource is that part of a Mineral Resource for
which quantity, grade or quality, densities, shape and physical
characteristics are estimated with sufficient confidence to allow
the application of Modifying Factors in sufficient detail to
support mine planning and evaluation of the economic viability of
the deposit.
Geological evidence is derived from adequately
detailed and reliable exploration, sampling and testing and is
sufficient to assume geological and grade or quality continuity
between points of observation.
An Indicated Mineral Resource has a lower level
of confidence than that applying to a Measured Mineral Resource and
may only be converted to a Probable Mineral Reserve. Mineralization
may be classified as an Indicated Mineral Resource by the Qualified
Person when the nature, quality, quantity and distribution of data
are such as to allow confident interpretation of the geological
framework and to reasonably assume the continuity of
mineralization. The Qualified Person must recognize the importance
of the Indicated Mineral Resource category to the advancement of
the feasibility of the project. An Indicated Mineral Resource
estimate is of sufficient quality to support a Pre-Feasibility
Study which can serve as the basis for major development
decisions.
Mineral ReserveMineral Reserves
are sub-divided in order of increasing confidence into Probable
Mineral Reserves and Proven Mineral Reserves. A Probable Mineral
Reserve has a lower level of confidence than a Proven Mineral
Reserve.
A Mineral Reserve is the economically mineable
part of a Measured and/or Indicated Mineral Resource. It includes
diluting materials and allowances for losses, which may occur when
the material is mined or extracted and is defined by studies at
Pre-Feasibility or Feasibility level as appropriate that include
application of Modifying Factors. Such studies demonstrate that, at
the time of reporting, extraction could reasonably be justified.
The reference point at which Mineral Reserves are defined, usually
the point where the ore is delivered to the processing plant, must
be stated. It is important that, in all situations where the
reference point is different, such as for a saleable product, a
clarifying statement is included to ensure that the reader is fully
informed as to what is being reported.
The public disclosure of a Mineral Reserve must
be demonstrated by a Pre-Feasibility Study or Feasibility
Study.
Mineral Reserves are those parts of Mineral
Resources which, after the application of all mining factors,
result in an estimated tonnage and grade which, in the opinion of
the Qualified Person(s) making the estimates, is the basis of an
economically viable project after taking account of all relevant
Modifying Factors. Mineral Reserves are inclusive of diluting
material that will be mined in conjunction with the Mineral
Reserves and delivered to the treatment plant or equivalent
facility. The term ‘Mineral Reserve’ need not necessarily signify
that extraction facilities are in place or operative or that all
governmental approvals have been received. It does signify that
there are reasonable expectations of such approvals.
‘Reference point’ refers to the mining or
process point at which the Qualified Person prepares a Mineral
Reserve. For example, most metal deposits disclose mineral reserves
with a “mill feed” reference point. In these cases, reserves are
reported as mined ore delivered to the plant and do not include
reductions attributed to anticipated plant losses. In contrast,
coal reserves have traditionally been reported as tonnes of “clean
coal”. In this coal example, reserves are reported as a “saleable
product” reference point and include reductions for plant yield
(recovery). The Qualified Person must clearly state the ‘reference
point’ used in the Mineral Reserve estimate.
Master CompositeA testing
sample comprised of multiple sub-samples taken from multiple
locations within an area of a deposit. This is a common practice
when individual samples are of insufficient size for a minimum
sample requirement for metallurgical tests. Source sub-samples are
selected to represent specific mineralization types or specific
areas within a deposit.
Probable Mineral ReserveA
Probable Mineral Reserve is the economically mineable part of an
Indicated, and in some circumstances, a Measured Mineral Resource.
The confidence in the Modifying Factors applying to a Probable
Mineral Reserve is lower than that applying to a Proven Mineral
Reserve.
The Qualified Person(s) may elect, to convert
Measured Mineral Resources to Probable Mineral Reserves if the
confidence in the Modifying Factors is lower than that applied to a
Proven Mineral Reserve. Probable Mineral Reserve estimates must be
demonstrated to be economic, at the time of reporting, by at least
a Pre-Feasibility Study.
Pre-Feasibility Study (Preliminary
Feasibility Study)The CIM Definition Standards requires
the completion of a Pre-Feasibility Study as the minimum
prerequisite for the conversion of Mineral Resources to Mineral
Reserves.
A Pre-Feasibility Study is a comprehensive study
of a range of options for the technical and economic viability of a
mineral project that has advanced to a stage where a preferred
mining method, in the case of underground mining, or the pit
configuration, in the case of an open pit, is established and an
effective method of mineral processing is determined. It includes a
financial analysis based on reasonable assumptions on the Modifying
Factors and the evaluation of any other relevant factors which are
sufficient for a Qualified Person, acting reasonably, to determine
if all or part of the Mineral Resource may be converted to a
Mineral Reserve at the time of reporting. A Pre-Feasibility Study
is at a lower confidence level than a Feasibility Study.
Relative Density / Specific
Gravity
The weight of a given volume of material
expressed as a ratio of the density of water. A specific gravity of
2.50 would indicate that a cubic meter of the material would weigh
2.5 metric tonnes.
SAG Mill Work Index – Short for Semi-Autogenous
Grinding – (A x b) – The SAG Mill Work Index is a
measure of the resistance of material to grinding in a SAG
mill.
It can be used to determine the grinding power
required for a given throughput of material under SAG mill grinding
conditions.. The index has no units. Higher values indicate better
performance through a SAG mill.
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