GENERAL41483

• Permit No: M1995097
• IBM Index Class Name: General Documents
• Doc Name: BIBLIOGRAPHY WITH INTRODUCTION GLOSSARY OF TERMS AND LIST OF MINERALS
• Media Type: D
• Archive: No

SPURR MONOGRAPH
crystals, or within thin fractures in barite (latter
called "criss-cross spar"). Crystalline calcite is
common and in all cases later than other gangue minerals
and sulfides.
Location of ores, pp. 229-231. without exception the
ores in the Aspen district occur along faults or in
faulted and fractured zones. On Smuggler mountain, ore
is found along the Silver fault [breccia I & II], but
most abundantly at intersections with other faults and
fractures, belonging for the most part to the Della
system.
Extent of ore deposition, pp. 231-232. The surface
extent of the Aspen district is largely identical with
the faulted and uplifted area extending from
Tourtellotte Park and Queens Gulch on the south to
Smuggler mountain on the north. Its vertical extent is
unknown, but is obviously much greater than the extent
shown by development from a high of over 11,000 ft. in
Tourtellotte Park to a low of less than 7,500 ft. in the
lower levels of the Mollie Gibson and Smuggler mines,
1,000 ft. below the Roaring Fork River. Samples from
elevations varying by over 3,500 ft. show no appreciable
differences in composition. "[T]he original ore
deposits extended far above the present surface, where
they are now revealed by erosion."
Agents of mineralization, p. 232. The formation of
sulfides was only a minor phase in the general
alteration that produced mostly dolomite, quartz, and
barite. The dolomite and quartz were most probably
derived from heated, ascending waters, and it is likely
that the same can be said for the associated sulfides.
Stratiaraphic position of ore deposits, pp. 232-233.
The principal ore deposits occur in limestone or
dolomite, mainly close to the Silver and Contact
faults.' There has been some production from Ordovician
[Manitou] dolomite in Queens Gulch, and a small amount
of Cambrian [Sawatch] quartzite ore was shipped from the
Princess Louise shaft in Spar Gulch. There is also
minor mineralization in the Maroon Formation of Red
mountain.10 In the main mineralized area ore has been
found extending through the entire blue limestone
9 Breccias; the "Contact fault" is a breccia that separates Red
Cliff Dolomite from the overlying Castle Butte Limestone in the Aspen
mountain mines. Contact breccia of Stegen, see generally STEGEN REPORT.
10 And at the south end of the district, the Montezuma mine, near the
head of Castle Creek.
Bruce A. Collins - 6 - BIBLIOGRAPHY