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| Projects Overview Cuale Bramador La Mina Desmoronado Aranjuez Technical Papers | Zinco Mining Corporation's 100% owned VMS project was acquired by staking 9 concessions during a period of depressed metal prices between 1998 and 2005. ZIM's property holdings, collectively referred to as the "Jalisco VMS Project", are centered in western Jalisco State between the cities of Puerto Vallarta, Talpa de Allende and Tomatlan (20o15' north, and 105o00' west). The nearest major center is Guadalajara, about 100 km east of Talpa de Allende. The properties are underlain by Jurassic rocks of the Mesozoic Guerrero Terrane, a complex island-arc assemblage that contains most of the known volcanogenic massive sulfide (VMS) districts in western and central Mexico. The Jalisco VMS Project, previously owned by Zimapan, S.A de C.V. (a subsidiary of Industrias Peñoles) and Cominco, records previous silver, gold and base metal production from 6 VMS camps (Table 2): Cuale, Bramador, El Rubi, Aranjuez, Desmoronado and La Mina. Click to enlarge 
Fig. 1 Map showing the location of the VMS Project ("ICU" on map). Modified from "Panorama Minero de Jalisco", Servicio Geológico Mexicano (SGM). Table 1. List of mining concessions comprising Zinco Mining Corporation's Jalisco VMS Project.
Fig. 2. Map of the VMS Project mining concessions. Historic VMS camps are in red. Table 2. Production figures for past producing mines on the ZIM concessions (Table 1). Figures for Cuale from Hall and Gomez-Torres (2000) and Miranda-Gasca (1995) for Amaltea in the Desmoronado camp.
Between 1984 and 1986, the International Cooperation Agency and Metal Mining Agency of Japan (JICA-MMAJ, 1986) and the Servicio Geologico Mexicano (SGM) conducted a multi-disciplinary exploration program for volcanogenic massive sulfide deposits over a 40 kilometer by 50 kilometer area in western Jalisco State. The work included regional geologic mapping, stream sediment geochemistry, geophysics and diamond drilling. The stream sediment samples were analyzed for Ag, Cu, Pb, and Zn (Table 3). Contiguous polymetallic geochemical anomalies were defined at Cuale, Bramador, Desmoronado, El Rubi, Aranjuez and La Mina. All of these extend beyond the known mines and workings. Table 3. Summary Distribution Statistics for 2517 stream sediment samples taken by the MMAJ in 1984-1985 (JICA-MMAJ, 1986).
*ACA=Average Crustal Value Fig. 3 Gridded zinc values for historic MMAJ stream sediment sample data Between 1998 and 2005, ZIM staked most of the geochemical anomalies identified by the MMAJ, and completed follow-up stream sediment sample surveying of most of the anomalous zones located by the earlier work. Summary distribution statistics for ZIM's stream sediment surveys are in Table 3. Of the 37 elements analyzed by ZIM, markedly anomalous results were returned for Mo, Cu, Pb, Zn, Ag, Mn, As, Au, Cd, Sb, Ba, Hg and Se. Table 3. Summary distribution statistics for 13 elements for 503 stream sediment samples from ZIM's VMS Project. ZIM's own results confirm the earlier work done by the MMAJ, and have identified several areas with significant gold potential.
ACA=Average Crustal Abundance Geological mapping by the UBC Mineral Deposits Research Unit (MDRU) and ZIM completed in the period 2002-2007 shows that VMS deposits occur in the Late Jurassic Cuale Sequence, which consists of (from the base upwards): (i) quartz-feldspar porphyritic rhyolite ignimbrite and cryptodomes, (ii) black argillite with massive sulfide and aphyric rhyolite and (iii) feldspar megacrystic and hornblende phyric pillow dacite with interbeds of argillite and limestone. Ore-grade massive sulfides occur both as stratiform layers in the argillite, and as quartz-sulfide replacements in tuffaceous rhyolite. Fig. 4 Geological Map of the Property. Regional map compiled from Bissig et al. (2006), the MMAJ-CRM geological survey of 1984-86 and the author's own mapping and interpretation of ICU's 2006 geophysical data. ZIM completed an 1859 line kilometre helicopter airborne electromagnetic, radiometric and magnetic survey to systematically evaluate its entire land package for bedrock conductors potentially related to massive sulfide mineralization in early 2006. Resistivity mapping successfully identified several areas of black shale, which has the best potential to host a large massive sulfide deposit. Within the black shales, about 320 specific bedrock conductors have been identified that merit further testing for massive sulfide potential. Fig. 5. Contour map of apparent resistivity. Data from Smith, 2006. VMS mineralization occurs in black shales that co-incide with resistivity lows (magenta) Fig. 6 Helicopter-borne electromagnetic system used to survey the ZIM land holdings in 2006 In the second quarter of 2006, ZIM started a major B-horizon soil geochemistry campaign to help prioritize some of the most promising geophysical and stream sediment geochemical anomalies for drill testing in 2008. Survey results for Cuale, Bramador and Aranjuez are summarized in Table 4. Collectively, the soil grids cover 147 or just under 50% of the airborne electromagnetic anomalies identified as part of the 2006 survey, and about 75% of the resistivity anomalies (lows) that are characteristic of the black shales. Specific results are discussed in the next Section. Table 4. Summary statistics for soil geochemical samples from 3 of 6 VMS camps on ZIM's Property in Jalisco, Mexico.
Fig. 7. Overview contour map of zinc geochemistry in soil. Fig. 8. Overview contour map of lead geochemistry in soil.
Click to enlarge Fig. 10. Overview contour map of gold geochemistry in soil.
Fig. 11. Overview contour map of copper geochemistry in soil.
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