386 GEOLOGY AND GOLD DEPOSITS OF THE CRIPPLE CREEK DISTRICT. 
C 
BLOCK 10, SCHOOL SECTION 16. 
A lease is being worked on block 10, school section 16, situated near Grassy 
Creek, just north of block 8. The workings consist of a vertical shaft 250 feet 
deep, with one level at the bottom representing 300 to 400 feet of prospecting. 
A crosscut to the southeast reaches, about 50 feet from the shaft, the large 
dike seen in block 8. It is here 8 feet wide and about vertical. Parallel with it 
on the northwest side is a mass of phonolite, probably a shattered phonolite dike. 
Twenty-five feet farther to the southeast is a dike of dense reddish phonolite. 
Beyond it is the smaller dike seen in block 8, and just to the southeast of it is a 
2-foot oxidized vein, with seams and stringers of manganese. Low-grade assays 
have been obtained from this dike. A drift runs southwest for 200 to 300 feet 
along the large basalt dike, and two crosscuts have been run southeast to the smaller 
dike and the vein. No ore has been found. 
The shaft on block 7, which lies between blocks 8 and 10, was closed and not 
-entered. It was worked under lease some time ago by the Woods Investment 
Company. They are said to have taken out 130,000 from a shoot between the two 
basalt dikes, which are here close together. The shoot pitches toward block 10, 
but the values gave out at a depth of 165 feet. 
