|Years of Operation:||1965 – 1966|
|Ounces of Gold Produced:||3,573|
Stairs Mine (Past Producer)
Approximately 19 miles west of Matachewan, immediately northeast of Frank Lake, in northwestern Midlothian Township. Shaft on boundary between claims MR26663 and MR 26665. Latitude 47.900 , Longitude 81.060 . Map reference: ODM 2187, Halliday and Midlo thian Townships.
The mine is located on the southern edge of a belt of steeply dipping Timiskaming meta sediments (conglomerate, greywacke, arkose, slate, and green carbonate rocks) which disconformably overlie Keewatin metavolcanics (rhyolite and rhyolite breccia). The ore zone is confined to the trough of a west ward-plunging right-lateral drag fold on the south limb of an east-plunging syncline. The drag-folded metavolcanic-metasedimentary contact trends N800W and dips steeply north. Gold-bearing quartz veins emanate from the hanging wall of a unit of unsheared rhyolite breccia and form tight fracture- fillings in a northeast-trending shear zone which intersects the trough of the plunging drag fold. The ‘A’ Zone consists of the Pope Vein and two subsidiary veins, the Marcasite and Chromic Veins. The Pope Vein strikes N550E, dips 750NW, is 1 to 2 feet in width, and consists of chalcopyrite, sphal erite, galena, tetrahedrite, gold, and gold-silver electrum in a gangue of quartz, calcite, siderite, and sericite. The 10-inch wide Marcasite Vein is subparallel to the Pope Vein and merges with it at depth. The 6-inch wide Chromic Vein has not been mined.
Assays of samples from sur face trenches mainly ranged from trace to 0.14 ounce of Au per ton. There were several high values, including one of 55 ounces of Au per ton. Reserves, to the 500 foot level, of proven and probable ore are 45,200 tons averaging 0.88 ounce of Au per ton and 95,700 tons averaging 0.25 ounce of Au per ton.
Leased by Stairs Exploration and Min ing Company Limited.
1944-1945: Prospecting and trenching by Upper Canada Mines Limited.
1947: Geological survey by Sherwood Gold Mines Limited.
Circa 1956: 12 diamond-drill holes (470 feet) by Anderson and Clark.
1959: Six diamond-drill holes (551 feet) by l.C. Stairs.
1962: Airborne geophysical survey and prospect ing. Surface diamond-drilling indicated gold-filled fracture zone. Adit (inclined 200 ) to vertical depth of 100 feet and some crosscutting and horizontal adit of unknown length. Shaft to 700 feet, levels at 80, 200, 350, 500 and 650 feet, 7,391 feet of under ground development, 7,647 feet of underground diamond-drilling, and 35,729 feet of surface dia mond-drilling. A 50- to 75-ton mill was installed underground on the 80-foot level. Production dur ing 1965 and 1966. All work by Stairs Exploration and Mining Company Limited.
1966: Mine closed and program to investigate several conductive zones (indicated by 1963 airborne geophysical survey) by Stairs Exploration and Mining Company Limited.
1968: Mine equipment sold.
1973: Option agreement with Conmont Mining Properties Limited.
|Year||Gold||Silver||Ore Milled||Recovered Grade|
|(ounces)||(ounces)||(tons)||(ounce of Au per ton)|
ODM 1947, Vol.56, pt.5, p.20 (Sher wood Gold Mines Limited).
ODM 1970, GR79, p.23-29.
Resident Geologist’s Files, Ontario Ministry of Na tural Resources, Kirkland Lake:
Midlothian Town ship, Stairs Exploration and Mining Co.
Gordon, J.B., Lovell, H.L., de Grijs, Jan, and Davie, R.F.
1979: Gold Deposits of Ontario, Part 2: Part of District of Cochrane, Districts of Muskoka, Nipissing, Parry Sound, Sudbury, Timiskaming, and Counties of Southern Ontario; Ontario Geological Survey, Mineral Deposits Circular 18, 253p.