Ontario Geological Survey Mineral Deposits Circular

Circular describing industrial mineral deposits, excluding aggregates, of northern Ontario (north and west of the Grenville Front). Information was compiled in 1979-81 through literature search of publications and files int he Toronto offices of the Ontario Geological Survey and the Offices of Regional and Resident Geologists. Deposit descriptions are listed by National Topographic System location, in numerical order, then compass order (northwest, northeast, southwest, southeast), then alphabetical order by commodity and deposit name. The name assigned to the deposit is that by which the deposit is commonly known or it is a reference to the company which holds the claim or did work on the deposit. For each deposit, location is given, by the NTS number and by latitude and longitude. Descriptive remarks are also given.

This report summarizes data on some 400 uranium and/or thorium deposits of northern Ontario, arranged first by district and then by township. Descriptions of deposits are arranged separately from descriptions of miscellaneous occurrences. Where available, information is included on the commodity present, location, local geology, ore grades, and development history. Includes index.

This report, in addition to providing information on the origin, physical properties, uses and world markets of vermiculite, presents the results of a comprehensive study of the occurrences in the Perth area of Ontario. This study includes detailed geological and mineralogical examinations and beneficiation tests of these occurrences.