Gold Pyramid occurrence (Malouf), Guibord Township, Cochrane District, Ontario, Canada

An old gold occurrence.

History:

1909: Claims in the area (including the northeast quarter of the north half of lot 11, concession VI, Guibord Township, which would eventually be staked as claim no. 2252) were staked by J.A. Monahan (Prest 1953). The Gold Pyramid Mining Co. of Larder Lake Ltd. was incorporated and sank a 25 foot deep exploration shaft on what was to become patented claim no. 2252 (Gibson 1910, Corkill 1911).
1911: Gold Pyramid Mining Co. sank two (additional?) prospect shafts to depths of 27 and 32 feet and erected on site a 5 stamp mill.
1916: The surface plant was destroyed by the Great Fire (Knight et al.
1919; The Northern Miner, June 30, 1917), before which time some Croesus Mine ore was milled (The Northern Miner, April 15, 1916).
1929: The north shaft was dewatered, sampled, and both veins were surface sampled (Prest 1953).

Geology:

Two narrow (no wider than about 1 foot) but persistent (traceable for hundreds of feet) 065 striking and vertically to steeply south dipping quartz-Fe-dolomite veins were the focus of surface and underground exploration and mining operations by Gold Pyramid Mining Co. of Larder Lake prior to 1916. The veins are hosted by (metamorphosed) turbiditic wacke and siltstone immediately southwest of the Contact Fault, a ...bedding parallel strike fault... which dies out eastward at the southern edge of Munro Township and cuts up-section in south-central Beatty Township... (Johnstone 1987, p.262). Near the occurrence, the steeply north dipping Contact Fault is localized along the contact between underlying Porcupine Group sediments and overlying Stoughton-Roquemaure Group volcanic rocks, and is locally characterized by lenses of carbonatization, quartz-carbonate veining, and sericitization (Johnstone and Trowell 1984, Johnstone 1987). Near the now flooded and detritus filled Gold Pyramid Mining Co. workings, intercalated wackes and argillites strike 152 and dip steeply south. Numerous fracture sets are developed in the sediments near the Contact Fault; mutually offsetting relationships suggest that these were formed approximately contemporaneously. A single well developed foliation striking 060-065 and dipping south 64 degrees occurs as a sericitic foliation in argillaceous interbeds and as a narrow, often quartz filled fracture cleavage in coarser grained wacke interbeds. The Gold Pyramid Mining Co. veins or vein systems appear to be oriented subparallel to this foliation.

Mineral List

8 entries listed. 8 valid minerals.

References