2020-12-02_PERMIT FILE - M2020060

• Permit No: M2020060
• IBM Index Class Name: Permit File
• Doc Date: 12/2/2020
• Doc Name: Is It Mining?
• From: Union Milling Contractord
• To: DRMS
• Email Name: DMC
• Media Type: D
• Archive: No

CONTENTS
Page
Introduction--------------------------------------------------------- 1
Methods of ore hunting used in the past------------------------------ 2
Present guides to ore------------------------------------------------ 5
Summary of geology--------------------------------------------- 5
Guides available and their significance--------------------------- 8
Breece Hill stock-------------------------------------------- 8
Other siliceous rocks---------------------------------------- 10
Vain.-, 11
Stockworks------ --------------------------------------- 12
Blue and White limestones----------------------------------- 13
Differences in composition, texture, and structure--------- 14
Roofs and floors----------------------------------------- 14
Ore channels; trend and distribution of ore shoots------------- 15
Channels in the vicinity of the Tucson-Maid reverse fault--- 15
Channels in the vicinity of other reverse faults------------ 20
Stringers or " feeders"----------------------------------- 22
Shattered rock above replacement ore bodies------------------ 23
Alteration borders or casings-------------------------------- 23
Enrichment in oxidized and sulphide zones-------------------- 26
Outcrops----------------------------------------------------- 28
Ore reserves--------------------------------------------------------- 29
Index--------------------------------------------------------------- 37
ILLUSTRATIONS
r
Page
PLATE 1. Sections along the most important inclined shafts in the Lead-
ville district---------------------------------------------- 10
2. Plan showing the more important veins and faults in the
eastern part of the Leadville district--------------------- 10
3. Map of stoped ore bodies in Leadville district------------ In pocket.
4. Columnar sections showing position and relative size of blanket
ore bodies in different parts of the Leadville district------- 16
5. Plan showing Tucson-Maid fault offset by the Iron, Mikado,
and R. A. M. faults-------------------------------------- 16
6. Cross section N. 63° E. through Tucson shaft, looking north-
west----------------------------------------------------- 20
7. Geologic sections showing general structure and relation of
Tucson-Maid fault to ore bodies in the Graham Park area--- 20
FIauxE I. Section through Mikado shafts----------------------------- 4
2. Plan of different levels of Tucson mine, showing relation of
Tucson-Maid fault to ore bodies------------------------- 17
3. Cross sections of ore bodies along Cord vein----------------- 18
4. Longitudinal section through Cord and White Cap winzes,
showing relation of ore to Gray porphyry sills and to
Tucson-Maid fault--------------------------------------- 19
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