The Pronto Mine

The Pronto Mine located at the east end of Lake Lauzon, Long Township, some 12 miles east of Blind River is of historic note being the discovery locality and the first producing mine of the Elliot Lake uranium camp. Radioactive bedrock was discovered in 1949, a commercial deposit was verified in 1953 and production commenced in 1955. Production continued to April 1960: total tons milled 2,264,404 from which 4,643,835 pounds U,O, were recovered at a recovered grade of 2.05 pounds U,O. per short ton.
The orebody is in a bed of pyritic quartz pebble conglomerate at the base of the Matinenda Formation of the Elliot Lake Group of the Huronian Supergroup. The rocks strike east and dip 15 degrees to 20 degrees south and unconformably overlie Early Precambrian granite, the upper surface of which is marked by a regolith. Several diabase dykes cut the orebody which is also affected by albite, chlorite, and carbonate-rich alterations. To the south the orebody is cut by a fault. The orebody is 6to 10 feet but locally 10 to 15 feet thick, has a strike length of 3,500 feet and extends down dip for 3,600 feet to a depth of 1,000feet. Some 300,000 tons of ore grade mineralization remain in the deeper portion of the mine.
Keywords: Uranium, Uranium exploration, Pronto Mine, Elliot Lake, Radioactive bedrock, ore grade mineralization
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Publication: Special Volume
Author(s): D. S. ROBERTSON, T. P. PODOLSKY and G. E. NUTTER
Keywords: Uranium, Conglomerate, conglomerate-hosted deposits, geology
Issue: 1986
Volume: SV 33
Year: 1986
Text
Publication: Special Volume
Author(s): DAVID S. ROBERTSON Toronto, Ontario
Keywords: Uranium, Uranium exploration
Issue: 1986
Volume: SV 33
Year: 1986
Text
Publication: Special Volume
Keywords: platinum-group elements, PGE, mineralogy, Recovery, Ores, conventional process
Issue: 1986
Volume: SV 33
Year: 1986
Text
Summary: Uranium, thorium and yttrium have been recovered, since the 1950s, from pyritic quartz-pebble conglomerates occurring in the basal sediments of the Quirke syncline at Elliot Lake. Gold, an element of interest in similar type deposits occurring worldwide, is a very minor constituent of the Elliot Lake conglomerates because the provenance area of the sediments had few gold-bearing rocks.
Uranium, thorium and rare elements are found in resistate and diagenetic minerals occurring in the matrix of...
Publication: Special Volume
Author(s): F.Q. BARNES, Consulting Geologist
Keywords: Uranium, Uranium exploration, Elliot Lake, Quirke syncline, milling
Issue: 1986
Volume: SV 33
Year: 1986
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Summary: The Agnew Lake uranium deposits were discovered in 1953 following the discovery of the Elliot Lake deposits to the west. The original property was optioned to Kerr Addison Mines Limited who added additional claims by staking. Agnew Lake Mines Limited was incorporated in 1967 to develop the property and a shaft was sunk to 1040 metres and five levels developed before work was suspended due to low uranium prices at the end of 1970.
In 1974-75 the mine was dewatered and production started in...
Publication: Special Volume
Author(s): C.K. WILTON, Senior Development Geologist, Kerr Addison Mines Limited
Keywords: Uranium, Uranium exploration, Geology, Agnew Lake Mine
Issue: 1986
Volume: SV 33
Year: 1986
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Summary: In the Blind River area Proterozoic clastic and sedimentary rocks and minor volcanic rocks (The Huronian Supergroup) uncomformably overlie and trangress northwards over dominantly granitic Archean terrane (2500 + Ma) and are intruded by Nipissing Diabase (2ll5 Ma). Later deformation and metamorphic events are recognized. The developing depositional basin was controlled by the incipient Great Lakes Tectonic Zone marginal to the Algoman Craton.
The Matinenda Formation (basal Huronian) comprises...
Publication: Special Volume
Author(s): JAMES A. ROBERTSON, Policy Advisor, Mineral Resources Branch, Ontario Ministry of Natural Resources **, Queen's Park, Toronto, Ontario
Keywords: Uranium, Uranium exploration, geology, Blind River, metamorphism
Issue: 1986
Volume: SV 33
Year: 1986
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