122 GEOLOGY AND GOLD DEPOSITS OF THE CRIPPLE CREEK DISTRICT. 
beginning of a zone of secondary sulphide enrichment, but this is erroneous. Occur¬ 
rences noted are as follows: 
Yellow Bird claim (Ellen McGregor group), near surface. 
Vindicator mine, 1,200-foot level. 
C. O. D. mine, level 10. 
Wilson claim, Bull Hill, surface. 
Prospect, 2,000 feet north of Iloosier mine. 
Ironclad mine, level 6. 
Puzzle vein, 60 feet above Ophelia tunnel. 
Isabella mine, Buena Vista vein, many levels, especially level 4. 
Isabella mine, Empire No. 2 vein, level 11. 
Isabella mine, Cheyenne vein, level 11. 
Mountain Monarch mine (near Doctor-Jackpot), level 2. 
Trachyte mine, 110-foot level (with 800 ounces silver per ton). 
Pointer mine, probably in all levels. 
Accident mine, probably in all levels. 
Anaconda mine, adit level. 
Last Dollar mine, levels 5, 10, and 12. 
Blue Bird mine, on 1,350-foot level; oxidized zone above was rich in silver. 
Dolly Varden mine. 
Sunset-Eclipse mine, 50 feet below surface. 
Hull City mine, in Shaft vein for 300 feet between levels 8 and 11. 
Doctor-Jackpot mine, 550 to 700 feet, Morning Glory levels. 
Moose mine, level 15. 
El Paso mine, level 1 (old workings). 
Portland mine, Lost Anna vein, level 10. 
CTialcocite (?).—A sulphide of copper, probably chalcocite, has been found in 
the Uncle Sam mine. 
Arsenopyrite .—We have not observed this mineral, which certainly is rare in 
the district. Mr. Edward W. Brooks, formerly chemist of the Ajax mine, states 
that it occurs occasionally with finely divided pyrite. 
OXIDES, CARBONATES, SULPHATES, SILICATES, ETC. 
Fluorite .—As a primary constituent of granite, fluorite occurs on Pikes Peak 
and probably also in the small area of Spring Creek granite in the northwestern 
part of the Cripple Creek district. It lias not been found in any other granites or 
fresh igneous rocks within the district. As a vein-forming mineral fluorite is very 
abundant, occurring in smaller or greater quantities in almost ever} 7- vein. It is 
ordinarily of a purple color of varying intensity, often very dark and rarely pale or 
colorless. The tendency toward crystallization is very marked, though the crystals 
rarely exceed 5 mm. in diameter. The universal form is the cube, in which form 
the mineral, together with quartz and dolomite, often coats the vugs and crevices 
in the rocks. Even when forming a solid vein filling the apparently granular mass 
consists of minute cubes cemented by quartz. To a limited extent the fluorite 
also appears as a product of replacement in all the various rocks in which the veins 
occur, especially in the so-called “granite ore.” 
Just outside the boundaries of the area represented on the map on both sides 
of Cripple Creek Canyon, purple and light-green fluorite occurs in narrow veins in 
granite. Whether these belong to the same period of vein-forming activity as the 
principal veins is doubtful. 
