Mining geology is by its very nature one of the most financially favoured and technologically advanced branches of the science, yet its theoretical basis is in many respects surprisingly incomplete. In particular, several centuries of inquiry have failed to produce a well-documented and generally acceptable theory of sulphide ore deposition. [...]

During the summer season of 1953 the author was employed by Noranda Mines Limited and was assigned to make a geological map of a group of mining claims located in the footwall of the Sudbury norite at the north-west corner of the basin area. The purpose of the work was to realize the extent and nature of the various rock types and, specifically, to make an appraisal of the economic possibilities of the area.

The phase relations in the Fe-As-S system at 600°0, studied in rigid silica glass tubes where a vapor phase is always present, are as follows: a liquid field extends along the S-As join from 100 to 22.8 +/- 0.2 weight per cent sulfur. An extensive pyrite-liquid-vapor field and a narrower pyrrhotite-liquid-vapor field are separated by the four-phase region pyrite-pyrrhotite-liquid-vapor in which the composition of the liquid is, in weight per cent, approximately As = 62.5, S = 37.5, and Fe = 0.11. [...]

The Chibougamau area lies just south of the 50th parallel and approximately 300 miles due north of Montreal. The area covered by map 304A of the Geological Survey of Canada (Mawdsley and Norman 1935) lies between latitudes 49°45'100" and 50°00'00" north and extends from longitudes 74°00'00" to 74°30'00" west.

The purpose of the present work is to investigate the growth of authigenic feldspars in sediments, more specifically in shales. Authigenic feldspars have been discussed frequently in the literature, but most of these discussions have been descriptive, and little information as to their probable mode of origin has been published. [...]

The Deschambault Formation of the St. Lawrence lowland of Quebec was investigated and defined by T. H. Clark during the course of mapping the geology of this area. The large fauna of this formation indicates that its age is middle Ordovician, being time equivalent to the Hull stage of the Trenton series (Clark, in press, a). The limestones of the Deschambault outcrop in a discontinuous belt on the northwest side of the St. Lawrence River from Montreal to a point just beyond Quebec City (Figure 1). Stratigraphic sections are exposed only in quarries and river channels because of the thick overburden formed by Pleistocene glacial deposits. Such outcroppings are readily accessible. [...]

This paper is a study of the minerals found in the Eastern Metals nickel-copper deposit. More emphasis is placed on the metallic sulphides, with brief descriptions of the non-metallic gangue minerals, except where these minerals play an important role in ore genesis. The origin of the nickel minerals violarite and millerite and the copper mineral chalcopyrite will be investigated. Various theories will be examined and a reasonable hypothesis will be advanced consistent with the observed facts.

The purpose of this study is to firstly, determine as accurately as optical methods permit the chemical composition of the various amphiboles in the Wabush Iron Formation. Secondly, determine the minerals associated with the amphiboles. Thirdly, give complete physical, optical, chemical and X-ray data for one of the grunerites and partial data for a manganiferous cummingtonite of the Wabush Iron Formation, to serve as a reference for other investigators who may be studying these amphiboles.

During the 1951 and 1952 field seasons, the writer was employed by the Ontario Department of Mines to carry out a geological survey on the greenstone belt in the vicinity of Lumby lake in the southeast corner of the District of Kenora, Ontario. During the 1951 season the area between Redpaint and Bar lakes was covered, and in 1952 mapping was extended southwestward to Finlayson lake and eastward to the Thunder Bay District boundary. [...]

Twenty-three base metal deposits in Late Precambrian layered rocks of the "Labrador Trough'', 250 miles north of Knob Lake, New Quebec, are described. The metals of the deposits are copper, nickel, zinc, lead, gold and silver; not all occur in one deposit.