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Museum of State Mining Bureau, Ferry Building, San Francisco, California. INTRODUCTION

Page

5

9

CHAPTER II.

FUELS (HYDROCARBONS)—

INTRODUCTORY

COAL

NATURAL GAS

PETROLEUM

11

11

12

14

CHAPTER III.

22

23

23

METALS

INTRODUCTORY

ALUMINUM

ANTIMONY

COPPER

GOLD

IRIDIUM. (See PLATINUM.)

IRON

LEAD

MANGANESE

MOLYBDENUM

NICKEL

OSMIUM

PALLADIUM

PLATINUM

QUICKSILVER

SILVER

TIN

TUNGSTEN

VANADIUM

ZINC

28

29

30

31

32

32

32

32

33

35

37

37

CHAPTER IV.

STRUCTURAL MATERIALS-

INTRODUCTORY

ASPHALT

BITUMINOUS ROCK

BRICK AND TILE

CEMENT

CHROME

LIME

MAGNESITE

MARBLE

ONYX AND TRAVERTINE

SANDSTONE

SERPENTINE

SLATE

STONE-MISCELLANEOUS

40

41

41

42

44

45

46

47

54

54

55

55

56

57

CHAPTER V.

INDUSTRIAL MATERIALS

INTRODUCTORY

ASBESTOS

BARYTES

CLAY-POTTERY

DOLOMITE

FELDSPAR

FULLER'S EARTH

GEMS

GRAPHITE

GYPSUM

INFUSORIAL EARTH

LIMESTONE

LITHIA

MICA

MINERAL PAINT

MINERAL WATER

PHOSPHATES

PUMICE AND VOLCANIC ASH

PYRITE

SILICA-SAND AND QUARTZ

SOAPSTONE OR TALC

STRONTIUM

SULPHUR

63

64

66

67

68

69

69

70

71

72

73

74

75

75

76

76

77

77

78

79

80

81

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48

LETTER OF INTRODUCTION.

The Bulletin herewith presented of the mineral industries of Cali. fornia is the result of a painstaking effort to so compile the statistics of production that they will be of actual use to producers and to those interested in the utilization of the mineral products of our state. In addition to the mere figures of output, we have included descriptions of the uses and characteristics of many of the materials, as well as a brief mention of their occurrences.

The compilation of accurate and dependable figures is an extremely difficult undertaking, and the State Mineralogist takes the opportunity of here expressing his appreciation of the universal co-operation of the producers in making this work possible. The response to our request for early replies is particularly pleasing. A fuller appreciation of the value of early responses to the requests sent out at the beginning of each year, will result in earlier publication of the data in the future.

It is the evidence herein put forth that should make us realize the magnitude of our latent mineral resources in this state. The total value for 1915 reached the sum of over ninety-six and a half million dollars, being a considerable increase over the preceding year.

For the current year of 1916, there is promise of still greater results in many lines. Except for the year 1883, the gold yield for 1915 was the largest California has shown since 1864. In addition to this, many inquiries are being received relative to this state's resources in the industrial minerals, such as asbestos, chrome, magnesite, manganese and many others.

FLETCHER HAMILTON,

State Mineralogist.

DEC 23 1953

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