COPPER ORES 197
Economic features 197
Geologic features 199
Copper deposits associated with igneous flows 200
Copper veins in igneous rocks 201
"Porphyry coppers" 203
Copper in limestone near igneous contacts 204
Copper deposits in schists 204
Sedimentary copper deposits 205
General comments 206
LEAD ORES 209
Economic features 209
Geologic features 211
ZINC ORES 213
Economic features 213
Geologic features 216