The Geology of Ore Deposits
The Geology of Ore Deposits
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It will be noticed that this subgroup has a distinct genetic similarity to that of the gold -quartz veins, and, as some of the silver ores of this subgroup contain gold, it will be readily recognized that the subtypes may be regarded as members of a gold-silver-sulphide-quartz group.
A similar remark applies to the subgroup of silver ores which is distinguished by the presence in the lodes of an appreciable amount of calcium carbonate, with accessory metallic sulphides and arsenides. The lodes ...have modifications in which the metals, such as silver, antimony, nickel, cobalt, and arsenic, occur native, and sometimes in association with zeolites when developed near igneous rocks.
The presence of barytes in considerable quantity, in addition to sulphidic minerals, is characteristic of some ig8 THE GEOLOGY OF ORE DEPOSITS silver veins, but of these a number are probably the enriched upper parts of lodes which in depth are rich in sulphides of lead, zinc, and copper.
Silver ores which are accompanied by considerable amounts of cobalt and nickel compounds appear to form an indefinite subgroup, in which bismuth ores occur with sulphides of lead, zinc, and copper.
What to read after The Geology of Ore Deposits?
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To quickly assess the difficulty of the text, read a short excerpt:
It will be noticed that this subgroup has a distinct genetic similarity to that of the gold -quartz veins, and, as some of the silver ores of this subgroup contain gold, it will be readily recognized that the subtypes may be regarded as members of a gold-silver-sulphide-quartz group.
A similar remark applies to the subgroup of silver ores which is distinguished by the presence in the lodes of an appreciable amount of calcium carbonate, with accessory metallic sulphides and arsenides. The lodes ...have modifications in which the metals, such as silver, antimony, nickel, cobalt, and arsenic, occur native, and sometimes in association with zeolites when developed near igneous rocks.
The presence of barytes in considerable quantity, in addition to sulphidic minerals, is characteristic of some ig8 THE GEOLOGY OF ORE DEPOSITS silver veins, but of these a number are probably the enriched upper parts of lodes which in depth are rich in sulphides of lead, zinc, and copper.
Silver ores which are accompanied by considerable amounts of cobalt and nickel compounds appear to form an indefinite subgroup, in which bismuth ores occur with sulphides of lead, zinc, and copper.
What to read after The Geology of Ore Deposits?
You can find similar books in the "Read Also" column, or choose other free books by H H Herbert Henry Thomas to read onlineMoreLess
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