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Huckleberry |
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British Columbia, Canada |
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Mo Cu Au
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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The Huckleberry porphyry copper-molybdenum deposit is located 140 km WSW of Endako and 123 kilometres southwest of Houston in the Rocky Mountains of central-western British Columbia, Canada.
The Huckleberry deposit consists of chalcopyrite and minor molybdenite deposited mainly in fractures in hornfelsed Middle Jurassic Hazelton Volcanics adjacent to a granodiorite stock. The intensity of mineralisation and alteration in the hornfels diminishes with distance from the stock.
The Hazelton Volcanics are predominantly fragmentals which regionally are mainly andesite-dacite in composition. The granodiorite stock at Huckleberry is of the order of 600 x 350 m in plan at surface, with steep sides. The higher grade mineralisation is concentrated on its eastern margin. The stock is principally a grey to pinkish, porphyritic granodiorite characterised by oligoclase phenocrysts.
Hornfels alteration, mainly as biotite development, extends for around 100 to 300 m outwards from the stock contact, and is gradational from complete recrystallisation within this width to patchy development of new minerals in the groundmass of the pyroclastics in the outer sections.
Additional alteration, also concentrically developed around the stock, include quartz and sericite, with carbonate and some pyrite and a limited amount of potash feldspar principally in or adjacent to fractures. This style of alteration also affects the porphyry near its contact. The pervasive alteration is surrounded by an indefinite zone with biotite partly altered to chlorite. The last phase involved gypsum, zeolites and stibnite in irregular patches and in veinlets.
The mineralisation occurs as blebs of chalcopyrite in hairline fractures, with associated quartz, some pyrite, magnetite, orthoclase, carbonate, chlorite and sericite. Molybdenite appears to be somewhat later than chalcopyrite, and is found in veinlets most frequently accompanied by quartz. Small amounts of chalcopyrite are widely distributed around and within the intrusive, with almost all holes intersecting substantial length assaying more than 0.1% Cu (James, 1976).
Published reserve and production figures include:
87 Mt @ 0.41% Cu, 0.05% Mo, 0.025 g/t Au (Res. 1976, James, 1976).
182.9 Mt @ 0.321% Cu (Measured+Indicated Resource, 2010, @ 0.2% Cu cutoff, Imperial Metals),
45.4 Mt @ 0.29% Cu (Inferred Resource, 2010, @ 0.2% Cu cutoff, Imperial Metals website)
14.01 Mt @ 0.362% Cu, 0.005% Mo (Proven+probable reserve, 2010, @ 0.2% Cu eq. cutoff, Imperial Metals website)
Production in 2005 totalled 6.9 Mt of ore @ 0.552% Cu 0.014% Mo.
The most recent source geological information used to prepare this decription was dated: 2006.
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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Selected References:
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James, D.H., 1976 - Huckleberry: in Sutherland Brown, A. (ed.)., 1976 Porphyry Deposits of the Canadian Cordillera, Canadian Institute of Mining Metallurgy, Special Volume 15, pp. 284-288.
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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