PERMFILE70533

• Permit No: C1981048
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT IV-1 THRU IV-6
• Media Type: D
• Archive: No

POR!
oaf resources_.. _.__. 154
Coal beds of the V,,..,tejo formation _________________ ____________ 154
Coal beds of the Raton formation_______________________________ 165
Coal reserves__________________________________________________ 159
Mining-------'-'--'-----'-'-----" ----------. -'__-------'--- 170
future development___________________________________________ 174
eferencea cited______'________'_________________'..._____..._____. 174
tdex____________________________________________________________ 170
ILLUSTRATIONS
LAre 12. Geologic tonic of the Trinidad coal field ....... ......... In pocket
louse l8. Index rasp of the Trinidad coal field_____ _________________ 13l
19. Cokednle coal bed in the upper part of the Vermejo formation__ 141
20. Frederick coal bad in the Raton formation.___.____..____._ 143
21. Coal bed in file Raton formation Intruded by aft igneous sill.. 147
TABLES
APLE 1. Analyeee of coals from the Trinidad coal field________________ 158
2. Claesificntion of coals by rank_______ _______________________ 168
3. Total catimated original coal reserves in the Trinidad coal field-. J5B
9. Estimated original reserves in fife Trinidad coal field_._.____._ IGO
5. Coal mined in the Trinidad coal field of Colorado front 1884 to
I BSG__________________________________° _..'_.___._-__ 171
• •
CONTRIBUTIONS TO ECONOMIC GEOLOGY
COAL RESOURCES OF THE TRINIDAD COAL FIELD IN
HUERFANO AND LAS ANIMAS COUNTIES, COLORADO
By Roes B. Jollxeort
AHBTRACT
The Trlnldad coal field underllea av area o[ about 1,100 square tulles In
Huertano and Lae Anlmae Counties, south-central Colorado, end extends from
the Colorado-New 11le:lco boundvrS northward almost to the lluer[nno River.
Its n•estern margin Is the eastern front of the Sangre de Crls[o Dfouvlalas,
and Its eastern margin extends [o longitude 104.30' 1Vest. The coal field la
largely o highly dlaeected upland wren In the westernmost port oC the Great
Plalve province, and the coal occurs lv rocks limited to the structural trough o[
the Raton basin.
8edlmentnry rocks of k'aleozolc, Slesozolc, and Cenozoic age crop otrt In or
near the Trlnldad coal geld. Rocks of pre-Cretaceous age are ezposed In the
Sangre de Cristo Mountvlna and the Wet Slouvtalna west and north of the rnal
field. Cretaceous artd younger rocks crop out In and adJacent to the field.
The sedlmettmry rocks In the coal field Include the Trlnldad avndatone ernl life
cool-bearing Vermejo formatlov of Cretaceous age, [he coal-bearing Raton [ormn-
tlon of Cretaceous end Paleocene age, the Poison Canyon [ormatlon o[ Paleocene
age, and the Cuchara and lIuerlavo(7) tornmtlane of Eocene age.
Igneous rocks hens been Intruded ae stocks, Inccollths, sole IvJectlons, plugs,
dikes, end sills Into the sedlmevtary rocks Iv and edjscevt to the Trlnldad coal
field. The Igneotte rocks vary In compoeltlon from maflc to elllclc, and range
In Isaacs Irma very floe to coarse grained.
The effect o[ contnet metnmorphlsm on the sedlmentnry rocks that were
Invvded by roogvtn generally woe not Rrent. However, xhnle has been altered to
elate and Ghyllite nt the \Vhlte Peaks, the Rlnck Illlls, vnd other smaller Intrttslve
masses. Contact metnmorphlc eQects ere very prominevt nett to the Intrnslve
mass o[ R'es[ Sponleh i'eak. Conglomerate, sandstone, and shale 6ede have
been altered to con6lomern[Ic qunrtzlte, qunrtzlte, hornfels, end elate. ]n n
[salted black that Iles between {Vest Spnnlsh Penk and Eaet Sponleh Peak, shale
and enndetone beds have been altered to elate and qunrtzlte. At several locnb
Itlea affix have replaced co¢I beds or vllered [hem to natural coke over several
square tulles. '
The Linton basin le the prhtcipnl structural tenhve of the coal field; IC Is
a brood neymmetrlc lrnug6 whose axis trends generally nnrthn•nrd lhrnuglt the
field. 9mnller [olds of variable orlev tatlon end calla[ vre scattered throughout
120