VI CONTENTS 



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85. Cross section through the Warren slopes of the New Almaden mine showing ore bodies formed in a thin 



apophysis diverging upward from a large intrusive sill 117 



86. Map of La Ventura slope area of the New Almaden mine showing localization of ore bodies along the lower 



contact of an intrusive sill 117 



87. Map of the Curasao slope area of the New Almaden mine showing localization of ore along the lower side of 



a sill where it forms a plunging inverted trough. 118 



88. Cross section through the Far West, Santa Rosa, and El Collegio slope area showing ore bodies localized near 



the lower conlact of an intrusive sill 119 



89. Map of the Moreno and Water stope area of the Guadalupe mine where ore bodies were formed along hilos 



that are not near intrusive conlacts 120 



90. Map showing the upper slopes and workings of Ihe Cora Blanca area of Ihe New Almaden mine where the ore 



occurred in veins and in fault gouge in tuff 121 



91. Graph showing production of the New Almaden mines, 1847-1945 inclusive. 129 



92. Index map of the NewAlmaden mine area showing parts of Ihe mine described as separale unils in Ihe text 131 



93. Perspective drawing showing the relation of the Randol and Victoria slopes lo Ihe upper surface of Ihe upper 



serpenline sill in the New Almaden mine 140 



94. Tramming on the 1500 level of the New Almaden mine 



95. Stope on the 1500 level of the New Almaden mine 



96. Geologic map of the Enriquita mine 153 



97. Geologic map of Ihe more recenl workings of Ihe San Antonio mine 155 



98. Map of the San Mateo mine 



99. Ruins of the mercury reduction plant at the Senator mine in 1947 160 



100. Generalized section through New Almaden mine along the Day tunnel 174 



101. New Almaden reduclion works in 1851 178 



102. New Almaden Hacienda in 1852 179 



103. View of Mine Hill in 1854 180 



104. Mexican miners in 1854 at one of the underground shrines in the New Almaden mine 181 



105. Labor, or stope, in the upper levels of the New Almaden mines in 1854 181 



106. Reduction furnace in use at the Hacienda in 1854 181 



107. The Hacienda, or furnace area, in 1854- 



108. Tramming large pieces of rich ore through the Main tunnel in the 1860's 



109. View of China dump and Spanish camp about 1870 



110. View of China dump area in 1874 --- 185 



111. Opencut on east side of Mine Hill in the 1880's. 186 



112. Shaft houses for the famous Randol shaft - -- 



113. Miners in two-decked cage in Randol shaft 



114. The Hacienda in 1875 



115. The Hacienda in late 1880's 190 



116. Santa Isabel shaft buildings in late 1880's 



117. Building housing the boilers, steam engines, and pumps for the Buena Vista shaft 



118. Hoisting equipment used at the Buena Vista shaft about 1885 



119. View of the Randol shaft hoisting works about 1885 - 191 



120. Washington shaft buildings in the middle 1880's 192 



121. Shaft house of Ihe Victoria shaft - - - 192 



122. Harry shaft buildings 



123. Square-set timbering used at New Almaden 



124. Openouts developed on Mine Hill between 1940 and 1945 194 



125. Rotary furnace plant built on Mine Hill in 1942 --- 



126. Mining equipment employed on Mine Hill in 1945 -- 195 



