Bulletin, Issue 78

Front Cover
State Office, 1918 - Geology
 

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Contents

MINES AND PLANTS ALPHABETICALLY BY COUNTIES
35
Plan and elevation of Abbott mine
54
Photosrnphs Pace 11 Exfoliation of basalt at Sulphur Hank mine
65
Hot springs in bottom of Western Cut at Sulphur Bank mine
66
Patriquin mine near Parkfield
74
Bins and furnace plant at the Etna mine
79
Geological map of Corona mine
82
Sketch of La Joya mine workings
84
Furnaces at La Joya mine
87
Dumps of lowgrade ore at Oat Hill mine
90
Serpentine surface near New Idria
94
Geologic map of New Idria District
94
Geological map of Stayton District
96
I8 Rotary furnace Aurora mine
100
Old and new prospect tunnels Florence Mack mine
104
Characteristic outcrops at Los Pieachos Peak Hernandez mine
106
Panoramic view of New Idria mine plant and town
108
Outline of orebody New Idria mine
110
Flashlight view in squareset stope New Idria mine
111
Ore trains at New Idria mine
113
New Idria mine showing open cuts and dumps
114
San Carlos mine open cut above No 2 level
116
Blower and stack from fineore furnace New Idria mine
118
Geological map of quicksilver districts in northwestern San Luis Obispo County
124
Map of Cambria mine workings
129
Detail of tramway and orebin Cambria mine
130
Old coarseore quicksilver furnace erected 1873 at Keystone mine
134
28a Klau mine showing old stopes and drifts exposed by later opencut opera tions
136
Open cuts at Oceanic mine
141
Microphotograph of dioritegahbro at the Oceanic mine
142
Plant of Oceanic mine
143
Tramway unloading terminal at Oceanic mine
145
Open cut at MilburnMcAvoy Los Prktos mine
151
Guadalupe mine
154
Map of New Almaden mine
161
Cottrell dust precipitator or hot treater at Senator mine
165
35a New 90ton Scott furnace at Senator mine
166
MINES AND PLANTSContinued Pese
168
Geologic map of St Johns mine
173
Map of underground workings 160foot level St Johns mine
176
St John s mine near Vallejo
177
Map of underground workings St Johns mine
178
Cloverdale mine
184
Great Eastei n mine near Guerneville
188
Socrates mine surface plant
194
Fiftyton Scott furnace and condensers at Phuenlx Mines
199
Exeli coarseore furnace
220
KnoxOsborne coarseore furnace
221
Neate coarseore furnace
222
Neate coarseore furnaces at the Bella Union mine
223
Livermore furnace at Cloverdale mine
226
Ray electric oilburners on Livermore furnace at Cloverdale mine
227
Side view of 50ton Scott furnace at Oceanic mine
229
Plan of HiittnerScott furnace
231
Top of HiittnerScott furnace
232
Discharge of Scott furnace
233
Sketch of Scott furnace section
237
Chart showing condensation temperatures for mercury vapor in fur nace gases
238
Quicksilver in earth and sand under site of old furnaces at New Almaden
242
Rotary oredrier above Scott furnace at Socrates mine
247
New rotary quicksilver furnace at New Idria mine
247
XXXVIA Revolving quicksilver furnace New Idria type
248
XXXVIB Flow sheet of New Idria revolving furnace plant
249
Herreschoff multiplehearth furnace at Senator mine
251
Top or dryinghearth of Herreschoff furnace
252
Cottrell precipitator or cold treater at Senator mine
253
Scott furnace and condensers at Klau mine
254
Ore drier at St John s mine
255
Knox ironclad condenser
256
Condensers at New Mercy Pacific mine
257
Barrell condensers at New Idria mine
258
Round wooden condensers at New Idria mine
259
Rectangular wooden condenser and flue at Oceanic mine
260
Condenser pipes of JohnsonMcKay retorts at Patriquin mine
261
Condenser system on JohnsonMcKay retorts at Sulphur Bank mine
262
Scotts brick condenser plant
263
Condensers and vltrlfledplpe flues at Etna mine
265
Cleaning up one of the new wooden condensers at New Idria
274
Soot mill at New Idria mine
275
QUICKSILVER ASSAYS
277
Whitton quicksilver apparatus
281
Whitton quicksilverassay apparatus showing component parts
283
Whitton quicksilverassay apparatus assembled
284
Chapter 2
286
Hyde Slide i laboratory flotation machine
300
PRACTICAL APPLICATIONS OF CONCENTRATION TO QUICKSILVER ORES
329
Plan and elevation of concentrating system Manzanita mine
331
Riffle unit Oat Hill mine
334
ESTIMATES OF CONCENTRATION COSTS
349
RE CALIFORNIAN OCCURRENCES ON GEOLOGY MINERALOGY
358
INDEX
367

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Page 23 - Becker1 reports admixtures of metallic mercury in the sulphide thus thrown down. Here, then, we have a possible explanation of the frequent association of free mercury and the black metacinnabarite, although relief of pressure may be in some cases the equivalent of dilution as a precipitant. Organic matter, also, is a probable agent of reduction, by which the metal is liberated. Bituminous substances, such as idrialite, napalite, etc., are commonly associated with cinnabar; and at the...
Page 363 - Preliminary Reports. •Preliminary Report No. 1. Notes on Damage by Water in California Oil Fields, Dec., 1913. By RP McLaughlin •Preliminary Report No. 2. Notes on Damage by Water in California Oil Fields. Mar., 1914. By RP McLaughlin •Preliminary Report No. 3. Manganese and Chromium, 1917.
Page 154 - Large bodies of croppings can be found in each of these ridges, having also a general northwestern trend, but not coinciding with the backbone of the ridges. "In the New Almaden ridge the most extensive orebodies have been found in and close to Mine Hill, the highest peak of the ridge, lying in its southeastern part. From this point going northwestward the...
Page 363 - Waring, 1914 2.00 •Bulletin 70. Mineral Production for 1914, with Mining Law Appendix. 1915 •Bulletin 71. California Mineral Production for 1915, with Mining Law Appendix and Maps. — Walter W. Bradley. 1916 Bulletin 72.
Page 328 - ... parties to commence gathering it in the vicinity of the locality now known as Cinnabar, where the surface-soil over a considerable area contained these particles of rich ore, much of which had been carried by the water and lodged along the adjacent ravines. Washing these ravines with rockers afforded the miners good wages for some time, when they finally came upon the veins from which these fragments had escaped, and which were found to be large and well charged with metal.
Page 257 - In condensing the quicksilver-fumes discharged from a roasting-furnace, the problem is much more difficult. The quicksilver-fumes furnish often less than 1 per cent., by volume, of the products of combustion with which they are mixed. Even the weight of the quicksilver is inconsiderable, compared with that of the gases which pass through the condensers. At New Almaden it is only about 2 per cent of the latter. These facts add greatly to the difficulties of condensation. For, in the first place, more...
Page 23 - Schrauf,'' who has studied the occurrence of mercury ores in Idria, is that the metal may be liberated by the direct dissociation of cinnabar vapor. He also ascribes the formation of some metacinnabarite to the action of hydrogen sulphide upon native mercury. Here again we are reminded that the same point may be reached by more than one road.
Page 358 - On Mineral Vein Formation now in Progress at Steamboat Springs Compared with the Same at Sulphur Bank.
Page 323 - Moore filter-leaf of the usual construction and the cake washed free of silver solution with water. The basket is then lowered Into the sodium sulphide solution and this solution drawn through the cake until the effluent shows only a trace of mercury. Usually 1 ton of solution per ton of residue is sufficient.
Page 25 - Dana1 rarely showing trapezohedral faces; also acicular prismatic. In crystalline incrustations, granular, massive; sometimes as an earthy coating ('paint'). The writer has a hand specimen from the CulverBaer Mine, Sonoma County, California, (see Plate IV) showing beautiful , transparent, somewhat tabular crystals, up to a quarter-inch across. Cleavage: prismatic perfect. Fracture subconchoidal, uneven. Somewhat sectile.

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