The geology at the southern end of Lake Mistassini was studied during the summers of 1956 and 1957. This thesis is a presentation of information gathered in the field, and deals with the problem of the Grenville front in the McOuat - Gauvin area.

This thesis deals with the geological settings of the gold deposits of the four producing mines of the Malartic district, Quebec. The mines are the Canadian Malartic, East Malartic, Barnat (formerly Sladen Malartic), and Malartic Gold Fields. These mines form the largest camp devoted solely to the mining of gold in the Province of Quebec.

Essentially, this work is a petrographical study of 504 feet of drill core taken from the top of the Potsdam sandstone at the Mallet well near Sainte-Thérèse, Québec. It is hoped that from this study additional information will be obtained concerning: The original rock types from which the material forming this part of the Potsdam sandstone was derived. The type of weathering undergone by this material and the conditions under which it was deposited. The number of cycles of erosion and deposition represented by the material in the Potsdam sandstone. [...]

An attempt is made in this thesis to interpret some geochemical patterns which resulted from the dispersion of certain base metals in soils and vegetation. The dispersion patterns obtained are of a secondary nature in that they are the result of weathering and decomposition of the primary mineral components occurring in a possible zone of mineralization. The factors, such as the mechanical aspect of dispersion and chemical environment are probably not too well understood and it is hoped that the results of this investigation will throw some light on the problems often encountered in geochemical investigations.

The areas under consideration in this thesis were geologically surveyed in the summer of 1954 by the Newfoundland and Labrador Corporation. Reconnaissance work was carried out by four field parties that were "spotted" at various locations during the summer, and by a helicopter party. One of the field groups was headed by the writer. The interval between traverses was from one-half to one mile. A study was made of thin sections cut from specimens collected by these parties and a description of these sections is the chief contribution of this thesis.

The area which La Chaloupe River drains, as well as the surrounding terrain, was mapped geologically during the four summer months of 1954 by M.A. Klugman. The writer acted as assistant to Mr. Klugman, on a party put in the field by the Quebec Department of Mines.

The airborne magnetometer was developed during World War II as a submarine detector, and is now a standard tool of modern geophysics. Since its development, the airborne magnetometer has helped locate valuable ore deposits, it has aided to decipher geological structures, and it has been used to investigate the possible future activity of volcanoes. Airborne magnetic surveys are not essentially different from land magnetic surveys: aeromagnetic data are obtained and compiled along a continuous line, whereas ground magnetic surveys are made at separate points.

The Middle Ordovician Tetagouche group is divided lithologically into four divisions: Rhyolite, Quartz-feldspar porphyry, Greenstone, and Slate. Except that members of the Slate and Greenstone divisions are scattered throughout the group, the rock divisions apparently are superposed in the above order. The porphyry is believed to be the intrusive equivalent of the rhyolite. The Greenstone division comprises greenstone, spilite, and minor ironformation. The subgreywacke-graptolitic shale-greenstone association indicates deposition in a eugeosyncline in an epineritic environment. The regional metamorphism is low grade (greenschist facies).

The Williamson's Diamond Mine is at Mwadui, Tanganyika Territory (British East Africa), longitude: 30°30' east, latitude: 3°30' south, 235 miles south of the equator. (See maps pp.la-2a). It is approximately 60 miles south of Lake Victoria ,and 420 miles due west of Mombasa harbor in Kenya Colony; it is 18 miles north-north-east from the administrative center of Shinyanga in the district of the same name. The mine area occupies approximately 9 to 10 square miles, and lies at an elevation of 4,000 ft above sea level.

The region described under this heading is located in the Grenville Province of the Canadian Shield. The description includes about three hundred square miles surrounding the feldspar deposits. The topography of the area is greatly influenced by the structure of the bedrock. Near the sea, where the land surface is low, bays and peninsulas form an irregular shoreline. Shape and location of the bays are determined by the strike and extant of the softer sedimentary rocks which underlie the submerged valleys.