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Home > Osisko - Hammond Reef > Articles > Geology and Mineralization
Osisko - Hammond Reef

Geology and Mineralization

Nov 8, 2014
Hammond Reef is in the Central Wabigoon Subprovince within the Archean Superior Province. It is situated near the western contact of the Marmion Batholith with the Finlayson greenstone belt. The Finlayson rocks consist mainly of metavolcanics that form a narrow deformed belt between the Marmion and Eye-Dashwa batholiths. The property is predominantly underlain by the Marmion granitoid rocks - freshly to intensely altered tonalite-trondhjemite with subordinate, unaltered granitoid gneiss and minor mafic lenses and pegmatite dykes. Regional-scale structures on the property are dominated by a prevalent northeast-southwest anastomosing shear system, generally dipping shallowly to the west. 








 
Mineralization Most of the known mineralization at Hammond Reef occurs on the peninsula between Sawbill and Lynxhead bays. This area is underlain mostly by tonalite and hosts the A zone, 41 Zone and the RAB Zone. The most prominent structural features in the A and 41 zones are the northeast-trending Upper and Lower Shears (thrust zones). These structures roughly bound the altered granitoid zone and the majority of the mineralization. The A (Main) and Mitta zones form a continuous deposit (west pit), while the 41 Zone is separate (east pit). The system has been modeled as two pits with a total strike length of 2,500 metres. Quartz stockwork overprints all rock units but is only weakly developed in the mafic lenses. The quartz stockwork hosts the gold mineralization. This stockwork is confined to a broad, anastomosing envelope of alteration measuring up to 6,000 m wide on surface exposures and has a northeast strike over a length of approximately 40 km. The trend of the alteration system, major quartz veins, gneissic enclaves and mafic lenses parallels the dominant east-northeast regional structural fabric. The mineralized bodies are roughly tabular in shape, striking east-northeast and dipping at moderate to shallow angles to the southeast. These zones often measure many tens of metres in thickness, with strike lengths measured in the hundreds of metres. The mineralization has been traced from surface to a depth of about 450 metres.

Source: http://www.agnicoeagle.com/en/Exploration/Advanced-Projects/hammondreef/Pages/default.aspx

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