深度风化在热带造成氧化硅,产生红土;在温带表现为深达百余米的氧化带和作为矿床标志之一的铁帽.这种氧化带往往是一种低阻的覆盖层.本文讨论的问题,限于在既不导电又无磁性的深度氧化环境里直接寻找硫化矿(闪锌矿除外).重磁方法在风化很深的地区探寻硫化矿能起很大的作用,但大多数是间接作用.比马矿(亚利桑那州)在矽卡岩中伴生有大量磁铁矿;巴格达德矿(也在该州)具有磁性低 Deep weathering causes silica in the tropics to produce laterite, and in temperate zones it is characterized by an oxidation zone of up to 100 meters and an iron cap as one of the sign of the deposit, which is often a low resistance coating The problem is limited to the direct search for sulphide ores (except sphalerite) in a deep oxidizing environment that is neither conductive nor magnetically.Magnetic gravity methods can play a large role in the exploration of sulphide ores in areas with very weathered areas, but most are indirectly The Bima Mine (Arizona) is associated with a large magnetite population in skarn; the Baghdad Mine, also in the state, has a low magnetic