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Camflo - Val d Or District |
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Quebec, Canada |
| Main commodities:
Au
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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All papers now Open Access.
Available as Full Text for direct download or on request. |
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The Camflo gold deposit is located in the Abitibi sub-province of the Archaean Superior Province in the Canadian Shield, between Malartic and Val d'Or in Quebec, Canada.
The geology of the mine is dominated by an approximately 200 m diameter, generally cylindrical, 2685±10 Ma stock of monzonite emplaced into a north-east plunging Z-fold at the contact between an overturned greywacke-iron formation-conglomerate unit of the Kewagama Group and mafic volcanic rocks and diorite sills of the Malartic Group. A swarm of small aplitic dykes cut the plug and pre-dates all hydrothermal veins. The majority of the gold comes from the parts of the stock cut by numerous gold bearing quartz veins, with lesser mineralisation in brittle-ductile shear zones cutting magnetite rich rocks of both the Malartic and Kewagama Groups. The mineralisation is dated as being 60 Ma younger than the stock.
There are 4 stages of veining and wall rock alteration as follows:
1). Early pegmatitic quartz-microcline-calcite-fluorite veins and flat lying quartz-calcite±pyrite±galena veining - these are all overprinted by actinolite-epidote±chlorite alteration,
2). Main stage commencing with brittle-ductile shear zones and gold-quartz veins with titanite and accompanying K feldspar alteration and mineralisation corresponding to a late north-south compression,
3). Transitional stage alteration and mineralisation whereby the brittle-ductile faults were re-opened by quartz-pyrite lodes flanked by schistose 1 to 2 m wide quartz-sericite-albite-calcite-pyrite alteration envelopes that leached gold from Main stage wall rocks, and
4). Late stage tourmaline and quartz-pyrite veinlets and chloritic seams, veinlets and breccias. Only trace gold was associated with transitional and late stage episodes, while the Early stage was also essentially barren of gold.
Mining commenced in 1963, with a preliminary reserve of 0.790 Mt @ 6.43 g/t Au. By 1966 the remaining reserve had been increased to 2.07 Mt @ 7.65 g/t Au.
Total production to mine closure in 1992 was 9.85 Mt @ 5.17 g/t Au (recovered; Northern Miner, 1992).
For more detail see the reference(s) listed below.
The most recent source geological information used to prepare this decription was dated: 1993.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Zweng P L, Mortensen J K, Dalrymple G B 1993 - Thermochronology of the Camflo Gold deposit, Malartic, Quebec: implications for magmatic underplating and the formation of Gold-bearing quartz veins: in Econ. Geol. v88 pp 1700-1721
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