Iron Cap

Other Names: KSM
District: Kitimat-Stikine
Commodities :   Copper, Gold, Silver

The KSM project located 65 km northwest of Stewart, British Columbia. Exploration of the project began in 2006 and proven and probably reserves currently total 38.2 million ounces of gold and 9.9 billion pounds of copper. The KSM project comprises four deposits, Mitchell, Iron Cap, Sulphurets and Kerr.

 

Rather than a single stock, mineralisation at KSM occurs within a gold-enriched copper porphyry system controlled by a series of high-level monzonitic dykes, sills and plugs, collectively referred to as the ‘Mitchell Intrusions’. These intrusions are hosted within volcanic rocks of the Jurassic Hazelton Group and are in fault contact with silicious hornfels sedimentary and intermediate volcanic rocks of the Upper Triassic Stuhini Group. All lithologies are altered as a result of a relatively shallow, long-lived hydrothermal system generated by the monzonite intrusion.

 

The Mitchell zone is exposed in an erosional window below the Mitchell thrust fault which truncates the upper part of the deposit. The deposit comprises schistose rocks with abundant sericite, disseminated pyrite and a strongly deformed quartz stockwork. In the core of the Mitchell deposit, quartz veins constitute more than 50% of the rock, with chalcopyrite being the principal copper mineral, and grades of both copper and gold in remarkably uniform occurrences.

 

2 km south of the Mitchell zone, the Sulphurets deposit occurs at structurally higher levels between the Mitchell and Sulphurets thrust faults. Mineralisation is structurally stacked in this area, although the principal Sulphurets zone is a moderately developed quartz stockwork that is cross-cut by a higher grade hydrothermal breccia zone. The north-dipping Sulphurets thrust fault truncates the top of the deposit.

 

Mineralisation in the Kerr area forms a mostly continuous, north-south trending and westerly dipping, irregular body at least 1700 m long, and up to 200 m thick. Higher grades are associated with crackled quartz stockwork, anhydrite veining, and chlorite alteration. It is enveloped by a schistose, pyrite rich phyllic alteration with low to moderate grades. Mineralization is open at depth and along strike.

 

(Source: P. Wojdak, 2009. Northwest Region. www.em.gov.bc.ca Accessed: 30/07/12)

DM Sample Photographs

Theses