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QUEBEC DEPARTMENT OF NATURAL RESOURCES
MINERAL DEPOSITS SERVICE
RADIOACTIVE OCCURRENCES IN THE GRENVILLE OF QUEBEC
MONT LAURIER — CABONGA DISTRICT
Ministère des Richesses Nature}les, Quebec r;. LA DtJCI: Nï`c:N'; t;T tON TECHNIQUE
Date:...21 ~. ../ .q: No
L. Kish
1975 INTRODUCTION
The predominant portion of Quebec's radioactive occurrences are found in the Grenville geological Province. The occurrences can be grouped into radioactive districts by their areal concentrations, such as can be outlined around Kipawa lake, in the Gatineau Park area north of Ottawa, in a broad belt NNW of Mont Laurier, and in several other places along the north shore of the St-Lawrence river.
The subject of this report is the district that extends north of
Mont-Laurier and east of Cabonga reservoir. The geological map that accom- panies this report is limited by longitudes 75° and 76°45' and latitudes
46°45' and 47°30' and covers an area of about 4000 square miles. Subsequent-
ly this map is referred to as "the compilation map".
PREVIOUS WORK
The first published geological reconnaissance work and the earliest reference to radioactivity in the area is by Retty (1934) (p. 147), who noted that the "pegmatite dykes are a possible source of radioactive minerals".
Systematic geological mapping on a scale of one mile to one inch by Quebec Department of Natural Resources started around Cabonga reservoir in 1959. Preliminary reports used in the compilation are by Laurin (1960,
TABLE OF CONTENTS
Page INTRODUCTION 1