Northern Nevada is so intensely mineralized that it offers the opportunity to visit mining districts where multiple commodity types have been explored for and mined over the past 150 years. The region is host to a plethora of deposit types, from synsedimentary stratiform bedded barite (exhalative) to sedimentary, igneous related porphyry copper and molybdenum, skarns, and all manner of epigenetic occurrences (veins, mantos, etc.). The material for this week-long field trip covers a number of gold deposits located in and around historic mining districts throughout northern Nevada. The guidebook includes a detailed itinerary and route map.

Northern Nevada is so intensely mineralized that it offers the opportunity to visit mining districts where multiple commodity types have been explored for and mined over the past 150 years. The region is host to a plethora of deposit types, from synsedimentary stratiform bedded barite (exhalative) to sedimentary, igneous related porphyry copper and molybdenum, skarns, and all manner of epigenetic occurrences (veins, mantos, etc.). The material for this week-long field trip covers a number of gold deposits located in and around historic mining districts throughout northern Nevada. The guidebook includes a detailed itinerary and route map.

Abstract The Meikle and Betze/Post orebodies are two Carlin-type, sedimentary rock-hosted, disseminated gold deposits, located in north-central Nevada along the Carlin trend (Fig. 1). They display important differences in size, alteration, sihcification, pyritization, and gold grade. The Post/Betze deposit, 14 km northwest of Carlin, Nevada, is fairly representative of Carlin-type deposits. It is a medium- to high-grade, disseminated gold deposit with alteration effected by argillization, decalcification, and local silicification. Published ore reserves are 23.4 million ounces of gold at an average grade of 0.19 oz/ton of gold (Barrick Gold Corp. Annual Report, 1997). The Meikle deposit, is located 2 km northwest along strike of the Betze/Post deposit. It is a high-grade, sediment-hosted gold deposit with extensive silicification, brecciation, and pyritization and contains gold reserves of 6.1 million ounces of gold averaging 0.72 oz/ton of gold (Barrick Gold Corp. Annual Report, 1997). Petrographie and microfhermometric data were gathered from each deposit to determine the mineral paragenesis, pressure, temperature, fluid composition, and depths of formation.