Zinco Mining Reports on Drilling Results for Jesus Maria, Cuale District, Jalisco VMS Projec
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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
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Hole Interval Silver Gold Copper Lead Zinc
ID From (m) To (m) (m) (g/t) (ppb) (ppm) (ppm) (ppm)
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ZIM43 42.00 48.00 6.00 36 778 9 41 242
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ZIM44 8.00 32.00 24.00 66 383 67 289 232
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ZIM45 68.00 99.00 31.00 9 45 1373 5354 31346
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ZIM46 77.00 89.00 12.00 29 89 427 4951 9387
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ZIM46 89.00 121.00 32.00 9 27 93 1473 3275
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ZIM46 121.00 152.50 31.50 13 91 2066 10738 47422
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ZIM47 63.00 64.00 1.00 11 48 1073 6065 8047
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ZIM47 124.00 140.00 16.00 1 6 28 10 3539
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ZIM47 150.00 152.00 2.00 5 8 4736 20 149
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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.
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Contacts:
Zinco Mining Corporation
David Elgee, President
(604) 507-2181
(604) 507-2187 (FAX)
www.zincomining.com