AND CLASSIFICATION OF MINERAL DEPOSITS 29
VARIOUS METHODS OF CLASSIFICATION 29
NAMES 31
MINERAL DEPOSITS AS MAGMATIC SEGREGATIONS IN IGNEOUS ROCKS 34
MINERAL DEPOSITS WITHIN AND ADJACENT TO IGNEOUS ROCKS,
WHICH WERE FORMED IMMEDIATELY AFTER THE COOLING AND
CRYSTALLIZATION OF THE MAGMAS THROUGH THE AGENCY OF HOT
MAGMATIC SOLUTIONS 36
Evidence of igneous source 37
Possible influence of meteoric waters in deposition of ores
of this class 41
Zonal arrangement of minerals related to igneous rocks 42
The relation of contact metamorphism to ore bodies of the
foregoing class 45
SECONDARY CONCENTRATION IN PLACE OF THE FOREGOING CLASSES OF
MINERAL DEPOSITS THROUGH THE AGENCY OF SURFACE SOLUTIONS 46
RESIDUAL MINERAL DEPOSITS FORMED BY THE WEATHERING OF
IGNEOUS ROCKS IN PLACE 50
MINERAL DEPOSITS FORMED DIRECTLY AS PLACERS AND SEDIMENTS 51
Mechanically deposited minerals 51
Chemically and organically deposited minerals 52
SEDIMENTARY MINERAL DEPOSITS WHICH HAVE REQUIRED FURTHER
CONCENTRATION TO MAKE THEM COMMERCIALLY AVAILABLE 54
ANAMORPHISM OF MINERAL DEPOSITS 57
CONCLUSION 58