Geology of Brunswick No. 12 Mine

CIM Bulletin, Vol. 70, No. 782, 1977

William M. Luff, Mine Geologist, Brunswick Mining and Smelting Corporation Ltd., Bathurst, New Brunswick

This paper outlines the regional geology and history of the area, and summarizes the stratigraphy, structure and geology of the Brunswick No. 12 mine area. The Brunswick No. 12 deposit is a stratisform massive sulfide body. It occurs in rocks of the Tetagouche Group, which is believed to range in age from Lower to Middle Ordovician. The stratigraphic sequence, including the stratiform orebody, in ascending order consists of older metasedimentary rocks, augen schist, metasediments, augen schist, foot-wall metasediments, the massive sulfide body, iron formation, hanging-wall metasediments, siliceous tuff, basic volcanic rocks, basic iron formation and a porphyry dike. This sequence is similar to that at some other deposits in the area. Four phases of structural deformation are known to be present in the Brunswick No. 12 mine area. The first deformation folds (F1) and associated faulting are the most important factors in determining the distribution of the massive sulfides. This deformation has resulted in the massive sulfides being separated into four zones: the Main Zone, the West Zone, the East Zone and the V-Z Zone. Brunswick Mining and Smelting Corporation Limited is actively mining, developing and exploring the deposit.

Keywords: Mine geology, Brunswick No. 12 Mine, Stratigraphy, Structural - geology, Massive sulphides, Tetagouche Group, Bathurst-Newcastle area, Metal zoning.