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The Orvan Brook area lies on the northwest limb of a large northeasterly plunging anticlinorium that contains volcanic and sedimentary rocks of the Middle Ordovician Tetagouche Group. The host rocks in ascending order are quartz and feldspar augen-schists, iron-formation, s ericite schist, graphite schist, argillite and gr eywacke, and meta-ande site. The massive sulphide zone is coextensive with the sericite schist or occurs at the contact of the sericite schist and the overlying graphitic schist. It has a maximum known thickness of 16 feet and has been traced for a length of 8, OOO feet and a depth of 500 feet. The sulphides are massive, fine grained and banded, and consist of pyrite, sphalerite, galena, chalcopyrite, arsenopyrite, and tetrahedrite. Approximately 80 per cent of the sulphide zone is composed of pyrite. The gross relationships between the sulphides and host rocks suggest the deposit is conformable. Detailed examination, however, reveals dis conformable features

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