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--_---__--_____-_-____-__ 177 Introduction .-_--_-_--_---____---- 178 Field work._.___.._...-..----..-.-..-.-.--- 178 Acknowledgments..---____--__.----_ 179 Geography.  ---_-_--_-_--___--_-____-_-_-_181 History and production. 184 Previous geologic investigations. ---.__-____-_.___.. 186 Geology..--_-_--.__-__-_-__-_- 186 Rock formations.187 General sequence- 187 Quartz monzonite.-__-_--_---____- 187 Comondii volcanics (Miocene)___. 188 Boleo formation (lower Pliocene)__--_-__-____-_.___-___.___189 Tuff--.. 191 Conglomerate.191 Tuffaceous limestone___----_---.-_-_-___192 Fossiliferous sandstone- 192 Gypsum.._._..__._..___.____.____..___._._._..._..._. 193 Fossils and age-_----_-_--___-_--___-____-_-__ 193 Origin of the Boleo formation-___----____.___-_-.__ 194 Gloria formation (middle Pliocene)_-____-__.___-__ 194 Infierno formation (upper Pliocene) 197 Santa Rosalia formation (Pleistocene) 198 Tres V.rgenes volcanics (Pleistocene or Recent).._-._.___.._.__ 199 Terrace and talus deposits (Recent) 201 Alluvium (Recent)..201 Structure...201 Manganese deposits.----__-_--_-_-___-_-_-___--._203 General features..---_-__-_--_-_-__-____-_-___--_ 203 Occurrence.. 203 Structure of the Lucifer deposit.  204 Structure contours.. 204 Faults--.---.I207 Thickness of ore____.---_-_-__-_-_____--__ 209 Extent of ore.-_-_----_----._----210 Mineralogy-_--_-__--_-_-__-__-.-_ 211 Grade and chemical composition of ore... 212 Uses of ore.. 214 Deposits other than the Lucifer.  214 Relation to copper deposits. 216 Origin of the manganese deposits. 217 Mining methods.. 219 Exploratory drilling program... 223 Reserves and future possibilities.____-__-_-_-__l___-__-__. 228 Literature cited-__-_--_-_-____-_--_--____.____ 229 Metric equivalents-_-_--_---_-__-_---_---_-_-._231 Index. _..._..__.___.__._...__._._ 233

Geology and manganese deposits of the Lucifer district, northwest of Santa Rosalia, Baja California, Mexico