Zinco Reports on Drilling Results for Jesus Maria, Cuale District, Jalisco VMS Project, Mexico
13 October 2011 - 1:05PM
Marketwired
Zinco Mining Corporation (TSX VENTURE:ZIM) (FRANKFURT:61Z) is
pleased to announce that it has obtained complete assay results for
579.5 meters of HQ diamond core drilling in holes ZIM43 to ZIM47
from Jesus Maria, a past-producing open pit mine in the Cuale VMS
District, Mexico. The primary objective of this stage of core
drilling was to clarify the geological context of RC drill hole
ZIM30, located 60 m east of the open pit, that returned values of
5.01% zinc, 1.39% lead, 0.21% copper, 14 g/t silver and 72 ppb gold
across 41.8 meters.
Overall, Zinco is very pleased with the results from this stage
of drilling for the following reasons:
-- The valuable reverse circulation (RC) intercept of ZIM30 was confirmed
and expanded with core drilling.
-- It provided the geological context for the zinc rich mineralization.
Geologically, zinc-rich massive sulfide occurs in fine-grained sediments
under a rhyolite flow-dome. The geometry of this geology can be used to
guide further drilling.
-- A new zone of precious-metal rich mineralization was discovered in the
flow-dome, above the base-metal rich horizon.
-- Clear lithogeochemical vectors for zinc rich mineralization (molar K/Al
of about 1) and feeder faults (molar Mg/Al greater than 0.75) are
present and can be used to help model the hydrothermal system and target
further exploration drilling.
Core hole ZIM45, collared 5 m southeast of ZIM30 and drilled
northerly (essentially a twin of ZIM30) returned values of 3.1%
zinc, 0.54% lead, 0.14% copper, 9 g/t silver and 45 ppb gold across
31 meters. ZIM46, drilled 30 meters west of ZIM45 and oriented
northeasterly, returned values of 4.74% zinc, 1.10% lead, 0.21%
copper, 13 g/t silver and 91 ppb gold across 31.5 meters.
Geologically, zinc-rich mineralization at Jesus Maria occurs
below a phenocryst-poor rhyolite flow-dome characterized by complex
flow banding and chaotic flow-breccias on the order of 150 meters
thick. Below the flow-dome, there are about 40 meters of thinly
laminated to medium bedded fine tuffs and cherts that host the
zinc-rich massive sulfide. The mineralization consists of honey
yellow to red sphalerite with galena, chalcopyrite and minor
pyrite. These metalliferous fine sediments grade downwards into
about 70 meters of coarse-grained, thickly bedded lapilli tuffs.
Below the tuffs, the rock consists of phenocryst poor, devitrified
rhyolite with abundant lithophysae, spherulites and perlitic
fractures. Devitrified rhyolite also underlies the San Juan and
Naricero VMS deposits in the Cuale District.
The flow-dome above the zinc-rich massive sulfide horizon also
contains gold and silver rich mineralization. Specifically, Hole
ZIM43, collared 45 m northeast of ZIM30, intercepted 6 meters of 36
g/t Ag and 0.78 g/t Au in rhyolite flow breccia cross-cut by
calcite veining. Similarly, Hole ZIM44, collared 70 meters north of
ZIM30 intercepted 24 meters of 66 g/t silver and 0.38 g/t gold, but
without any calcite veins. Neither of these two holes was drilled
deep enough to cut through the rhyolite flow dome into the
underlying zinc-rich sediments.
Hole ZIM47, drilled 65 meters east of ZIM30 and oriented
easterly, probably crossed a major fault marked by a diorite dike
in the upper part of the hole. Although it did eventually intercept
the cherty sediments that host massive sulfides in Holes ZIM30, 45
and 46, the alteration is characterized by massive black chlorite
with chalcopyrite and pyrite, minerals typically found in feeder
faults or alteration pipes of VMS deposits. From the analytical
data, the chlorite alteration is apparent from high molar Mg/Al
ratios in excess of 0.75 (with lower values reflecting partial
rather than complete alteration of rhyolite to Mg rich chlorite).
By way of contrast, molar Mg/Al ratios of the ore-grade intercept
in ZIM46 are all less than 0.09. However, molar K/Al ratios for the
intercept of ZIM46 are all close to a value of 1, a number that
implies potassic alteration in the form of K-feldspar could be
present. K-feldspar is not especially common in the VMS
environment, but has been documented in the footwall to Eskay
Creek, northern British Columbia. Sericite, a more typical
alteration mineral in VMS systems, including Cuale, has a K/Al
ratio of 1/3.
Further work, including drilling, is planned at Jesus Maria and
other promising targets on Zinco's concessions.
Table 1. HQ diamond drill hole intercepts from Jesus Maria,
Cuale VMS District, Jalisco, Mexico
----------------------------------------------------------------------------
Hole Interval Silver Gold Copper Lead Zinc
ID From (m) To (m) (m) (g/t) (ppb) (ppm) (ppm) (ppm)
----------------------------------------------------------------------------
ZIM43 42.00 48.00 6.00 36 778 9 41 242
----------------------------------------------------------------------------
ZIM44 8.00 32.00 24.00 66 383 67 289 232
----------------------------------------------------------------------------
ZIM45 68.00 99.00 31.00 9 45 1373 5354 31346
----------------------------------------------------------------------------
ZIM46 77.00 89.00 12.00 29 89 427 4951 9387
----------------------------------------------------------------------------
ZIM46 89.00 121.00 32.00 9 27 93 1473 3275
----------------------------------------------------------------------------
ZIM46 121.00 152.50 31.50 13 91 2066 10738 47422
----------------------------------------------------------------------------
ZIM47 63.00 64.00 1.00 11 48 1073 6065 8047
----------------------------------------------------------------------------
ZIM47 124.00 140.00 16.00 1 6 28 10 3539
----------------------------------------------------------------------------
ZIM47 150.00 152.00 2.00 5 8 4736 20 149
----------------------------------------------------------------------------
Qualified Person
This press Release was reviewed by Michelle Robinson, M.A.Sc.,
P.Eng., a Director of Zinco Mining Corporation, who acts as Zinco's
Qualifed Person as defined by NI 43-101. Geochemical assaying done
by Zinco was completed by Acme Analytical Laboratories according to
the procedures described in Zinco's News Release (NR 2011.05) dated
17 August 2011.
ON BEHALF OF THE BOARD,
David Elgee, PRESIDENT
Certain information regarding the Company including management's
assessment of future plans and operations, may constitute
forward-looking statements under applicable securities laws and
necessarily involve risks associated with mining exploration and
development, volatility of prices, currency fluctuations,
imprecision of resource estimates, environmental and permitting
risks, access to labour and services, competition from other
companies and ability to access sufficient capital. As a
consequence, actual results may differ materially from those
anticipated in the forward-looking statements.
NEITHER THE TSX VENTURE EXCHANGE NOR ITS REGULATION SERVICES
PROVIDER (AS THAT TERM IS DEFINED IN THE POLICIES OF THE TSX
VENTURE EXCHANGE) ACCEPTS RESPONSIBILITY FOR THE ADEQUACY OR
ACCURACY OF THIS NEWS RELEASE.
Contacts: Zinco Mining Corporation David Elgee President (604)
507-2181 (604) 507-2187 (FAX)www.zincomining.com
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