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i9< UNITED STATES sso °rte DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY 38A2 42470 620 Oil I MINE SUBSIDENCE 1. Four subsidence pits and one trough. First pit is 15' in diameter, 10' deep and overlies air shaft. Two pits are 15' in diameter, 2' deep and overlie rooms. Fourth pit is 25' in diameter, 3' deep and overlies hoist shaft. Trough is 75' long, 30' wide, and 8' deep; trends WNW. 2. Large subsidence pit over and around hoist shaft. Pit is 80' long, 55' wide and 15' deep; walls of pit nearly vertical. 3. Three troughs. Two troughs of minor significance; one is 20' long, 12' wide, 3' deep; second is 20' long, 6' wide, 3' deep; both mark former adits. Third trough is 90' long, 20' wide and 4' deep; marks collapse of former adit. 4. Three subsidence pits, one trough. Subsidence pits are 10' to 15' in diarrleter and 3' deep; pits due to subsidence over rooms. Trough is 75' long, 20' wide, 7' deep; due to subsidence over incline entry. I. T 5. Five subsidence pits, two troughs. Three pits are 15' to 25' long, 10' to 20' wide, 2' to 4' deep; due to subsidence over rooms. Two pits are 15' to 20' in diameter, 13' to 20' deep; due to subsidence around shaft and incline. Both troughs are 45' long, 15' to 20' wide, 3' deep-, one due to collapse over room, other due to collapse over incline. 6. Subsidence trough. Trough is 60' long, 20' wide, 6' deep; due to subsidence over incline entry. 7. Subsidence pits. Two large pits, one 50' long, 30' wide, 4' deep; other 50' in diameter, 3' deep. Two small pits 6' and 10' in diameter, 3' deep. All four pits due to subsidence over incline entries. 8. Subsidence trough and subsidence pits. Trough is 60' long, 20' wide, 3' to 4' deep; due to collapse of incline entry. Subsidence pits range in size from 5' to 30' in diameter, 2' to 4' deep; due to collapse over rooms. 9. Subsidence trough and pits. Trough is 60' long, 20' wide, 4' deep; due to subsidence over incline entry. One pit 4' in diameter 15' deep; other pit 10' long, 6' wide, 2' deep; both pits due to subsidence over inclines. 10. Subsidence pits. Four pits ranging in size from 5' to 10' in diameter and 3' to 4' in depth. Subsidence due to collapse over mine incline. 11. Subsidence pits. Two pits 8' in diameter, 3' to 5' deep; one,pit 15' in diameter, 5' deep. Pits due to subsidence over incline and behind mine entry, 12. Subsidence pit and trough. Pit is 10' in diameter, 12' deep; due to collapse around shaft. Trough is 50' long, 25' wide, 2' to 6' deep; due to collapse over incline. 13. Subsidence pits. One pit 45' in diameter, 10' deep; three pits ranging from 12' to 30' in length, 8' to 15' in width, 5' to 12' in depth; pits due to collapse over rooms. 14. Subsidence pits and troughs. Ten pi.ts ranging in size from 10' to 50' in diameter, 3' to 17' in depth. Two troughs 45' and 50' long, 20' and 30' wide, 6' and 4' deep. Most of pits due to collapse over rooms. 15. Three subsidence pits. One pit 10 feet in diameter, 15' deep, due to collapse around air shaft; second pit 30' long, 15' wide, 10' deep, possibly due to collapse over incline; third pit 30' in diameter, 20' deep, due to collapse over room. 16. Two subsidence troughs. One trough 25' long, 10' wide, 3' deep; second trough 45' long, 5' wide, 2' to 3' deep; both due to collapse over rooms. 38 °15' 10E Py` Mapped. edited, and published by the Geological Survey 4,49 Control by 11SGS and USC &GS t t Topography from aerial photographs by photogrammetric methods Aerial photographs taken 1954 Field check 1959 Polyconic projection 1927 North American datum 10.000 foot grid based on Colorado coordinate system, central and south zones 1000 meter Universal Transverse Mercator grid ticks, zone 13, shown in blue Dashed land lines indicate approximate locations Certain land lines omitted in T 20 S . 70W. because of insufficient data Fine red dashed lines indicate selected fence and field lines ROCKVALE QUADRANGLE COLORADO 14' 173 AREAS MINE OPENINGS e = 1. One vertical opening. Opening is over air shaft; 15' in diameter, w U 10' deep; nearly filled by soil, rock and trash; barbed wire fence �2 Mine opening around pit is in poor condition; less than 100' from county road. DRAWING NO. Fe Access deterrence.poor. DECLINATION, 2. Three vertical openings. Opening over air shaft is 5' square and is Mine fire 80' deep; barbed wire fence around opening in fair condition. Air shaft Openings over two hoist shafts are 15'xl2'x3O' deep and 20'xl5'x25' t Adit or incline deep; both shafts bridged by trash, earth and rock; barbed wire drainage fence around openings in fair condition. Access deterrence fair. 3. One inclined opening. Opening of incline is 2.5' high, 4' wide and goes into hillside an unknown distance; mine roof partially collapsed; no access deterrent. 4. One vertical opening. Opening of air shaft is 3' by 4' and is about 30' deep; shaft is intact; no access deterrent. 5. One horizontal opening. Mouth of adit is 5' high, 10' wide, well 160 000 FEE supported by timbers; intact adit goes into hillside more than (CENTRAL 100'; no access deterrent. 6. One vertical opening and-one inclined opening. Air shaft is 20' square at surface, 15' to 20' deep; partially collapsed and bridged. Incline is 13' square at surface and forms pit 15' to 20' deep; partially collapsed. Mayor of Williamsburg has thrown 55 gallon drums in pits to prevent access to underground workings. Access deterrence good. 7. One vertical opening. Opening is subsidence pit leading into mine incline. Opening at top of pit is 4' in diameter; bottom of pit is 8' wide; pit is 15' deep and has overhanging walls; no warning, no access deterrent. T.20s 8. One inclined opening. Opening of incline is 3.5' high, 5' wide; T 21 S intact incline goes into hillside an unknown distance; no access deterrent. 38 °15' 10E Py` Mapped. edited, and published by the Geological Survey 4,49 Control by 11SGS and USC &GS t t Topography from aerial photographs by photogrammetric methods Aerial photographs taken 1954 Field check 1959 Polyconic projection 1927 North American datum 10.000 foot grid based on Colorado coordinate system, central and south zones 1000 meter Universal Transverse Mercator grid ticks, zone 13, shown in blue Dashed land lines indicate approximate locations Certain land lines omitted in T 20 S . 70W. because of insufficient data Fine red dashed lines indicate selected fence and field lines ROCKVALE QUADRANGLE COLORADO SCALE 1:24000 2 0 1 MILE 1000 0 1000 2000 1001) 4000 5000 6000 ]boo FEET 1 5 p 1 MILOMETER CONTOUR INTERVAL 20 FEET r1Ai11M I MIA11 .;11,li 10IS MAP COMPLIES W11F1 T)ATn1NAL MAP ACCURACY STANDARDS FOR SALE BY U. S. GEOLOGICAL SURVEY, DENVER 25, COLORADO OR WASHINGTON 25, D.C. A POLDER DESCRIBING TOPOGRAPHIC MAPS AND SYMBOLS IS AVAILABLE ON REQUEST Gy' Opp 9 4� 30" 3 °22';0" oLxr F(eT lrRAL) s 1s v,,T 0 MINE OPENINGS (cont.) 9. Vertical opening. Air shaft is 15' long, 10' wide, more than 50' deep; shaft intact and open; no access deterrent.' 10. Horizontal opening and collapse pit. Pit is 10' long, 7' wide, 15' deep; formed by collapse into mine adit; mouth of adit itself is plugged; no access deterrent around pit. Second adit on upper level has opening 8' wide, 5' high; goes into hillside at least 25'; partially collapsed; no access deterrent. 11. Inclined opening. Mouth of incline is 4' high, 3' wide; opening goes into hillside an unknown distance; entry of incline partially collapsed; no access deterrent. 12. One inclined opening and one vertical opening. Air shaft is 35' in diameter; meets main incline at depth of 25'. Main incline has an opening 9' long, 4' wide; slopes underground an unknown distance. Both openings partially collapsed; neither has access deterrent. 13. Two horizontal openings. Openings originally 8' high, 12' wide; south opening partially obstructed by strip mine spoil; goes into hillside an undetermined distance; openings are rooms exposed by strip mining; rooms intact; no access deterrent. 14. One vertical opening. Hoist shaft 4' square at surface, 50' deep; shaft intact and timbered; barbed wire fence around shaft lying on ground. 15. One vertical opening. Opening is air shaft inside unlocked fan house. Shaft is 6' square and 30' deep, intact, concrete lined, has no access deterrent. Shaft has iron ladder to bottom. 16. One horizontal opening. Entry to adit is 5' high, 4' wide; adit goes into hillside an unknown distance; adit intact, no collapse; no access deterrent. 17. Horizontal opening. Entry to adit is 5' high, 4' wide; goes into hillside an unknown distance; adit intact, supported by timbers and concrete; no access deterrent. f 1. Coal waste bank on fire. Waste spread out in blanket -like form over an area of about two acres. Coal waste probably averages 1' to 3' in thickness, may be as much as 10' thick in places. From 1970 to 1980 the waste bank has periodically caught fire. Ignition may have been caused by grass fires or by spontaneous combustion of finely comminuted coal. In the past, fires have burned over local areas of waste bank and have either been put out or have gone out naturally. In the fall of 1980 an area about 50' by 70' was burning. On several occasions during the past decade unwary children and pets have been burned while playing in the area. These accidents occur because the surface of the burning area appears to be normal and may even be cool to the touch; a few inches below the surface however temperatures are high enough to inflict severe burns. MINE DRAINAGE 1. Operators of G.E.C. strip mine have diverted Newlin Creek northward around mine area. In spring of 1980 stream broke through diversion channel and flowed into open pit. From there it flowed into rooms of Canon National mine which had been exposed by strip mining. After filling mine, water flowed out mouth of Corley #6 mine which is 0.6 miles north of Newlin Creek. Water then flowed down Second Alkalai Creek. By fall of 1980 the operators of G.E.C. strip mine had stopped flow into Second Alkalai Creek by plugging entry to Corley R6 mine. EXPLANATION 14' PROBLEM AREAS rc o e = z subsidence w U Coal - strip mine �2 Mine opening CONTOUR INTERVAL DRAWING NO. Fe APPROXIMATE MEAN DECLINATION, 1959 Hoist shaft Mine SCALE 1:24000 2 0 1 MILE 1000 0 1000 2000 1001) 4000 5000 6000 ]boo FEET 1 5 p 1 MILOMETER CONTOUR INTERVAL 20 FEET r1Ai11M I MIA11 .;11,li 10IS MAP COMPLIES W11F1 T)ATn1NAL MAP ACCURACY STANDARDS FOR SALE BY U. S. GEOLOGICAL SURVEY, DENVER 25, COLORADO OR WASHINGTON 25, D.C. A POLDER DESCRIBING TOPOGRAPHIC MAPS AND SYMBOLS IS AVAILABLE ON REQUEST Gy' Opp 9 4� 30" 3 °22';0" oLxr F(eT lrRAL) s 1s v,,T 0 MINE OPENINGS (cont.) 9. Vertical opening. Air shaft is 15' long, 10' wide, more than 50' deep; shaft intact and open; no access deterrent.' 10. Horizontal opening and collapse pit. Pit is 10' long, 7' wide, 15' deep; formed by collapse into mine adit; mouth of adit itself is plugged; no access deterrent around pit. Second adit on upper level has opening 8' wide, 5' high; goes into hillside at least 25'; partially collapsed; no access deterrent. 11. Inclined opening. Mouth of incline is 4' high, 3' wide; opening goes into hillside an unknown distance; entry of incline partially collapsed; no access deterrent. 12. One inclined opening and one vertical opening. Air shaft is 35' in diameter; meets main incline at depth of 25'. Main incline has an opening 9' long, 4' wide; slopes underground an unknown distance. Both openings partially collapsed; neither has access deterrent. 13. Two horizontal openings. Openings originally 8' high, 12' wide; south opening partially obstructed by strip mine spoil; goes into hillside an undetermined distance; openings are rooms exposed by strip mining; rooms intact; no access deterrent. 14. One vertical opening. Hoist shaft 4' square at surface, 50' deep; shaft intact and timbered; barbed wire fence around shaft lying on ground. 15. One vertical opening. Opening is air shaft inside unlocked fan house. Shaft is 6' square and 30' deep, intact, concrete lined, has no access deterrent. Shaft has iron ladder to bottom. 16. One horizontal opening. Entry to adit is 5' high, 4' wide; adit goes into hillside an unknown distance; adit intact, no collapse; no access deterrent. 17. Horizontal opening. Entry to adit is 5' high, 4' wide; goes into hillside an unknown distance; adit intact, supported by timbers and concrete; no access deterrent. f 1. Coal waste bank on fire. Waste spread out in blanket -like form over an area of about two acres. Coal waste probably averages 1' to 3' in thickness, may be as much as 10' thick in places. From 1970 to 1980 the waste bank has periodically caught fire. Ignition may have been caused by grass fires or by spontaneous combustion of finely comminuted coal. In the past, fires have burned over local areas of waste bank and have either been put out or have gone out naturally. In the fall of 1980 an area about 50' by 70' was burning. On several occasions during the past decade unwary children and pets have been burned while playing in the area. These accidents occur because the surface of the burning area appears to be normal and may even be cool to the touch; a few inches below the surface however temperatures are high enough to inflict severe burns. MINE DRAINAGE 1. Operators of G.E.C. strip mine have diverted Newlin Creek northward around mine area. In spring of 1980 stream broke through diversion channel and flowed into open pit. From there it flowed into rooms of Canon National mine which had been exposed by strip mining. After filling mine, water flowed out mouth of Corley #6 mine which is 0.6 miles north of Newlin Creek. Water then flowed down Second Alkalai Creek. By fall of 1980 the operators of G.E.C. strip mine had stopped flow into Second Alkalai Creek by plugging entry to Corley R6 mine. EXPLANATION ROTES I. All mines shown on this map were visited 'n Me field and the actudl or WtentIdi nards associated moth them were evaluated at tnat time These include mine openings, mine fires, and nine drainage. Alin regar( to simsidence it - should be noted that tbe map shows Only existing subsidence features rather than areas of potential subsidence. The latter can only be determined by site - specific studl es. 2. The mine outlines shown on this map are based )n original mine maps and surveys on flee at the - , :or,do Division of Mines and the Colorado State Archives and Records Office There may be minor inaccuracies in the mine outlines either because of inaccuracies in the original surveys or because of small discrepancies generated during the transfer Of the outline, Rom the large scale - original maps to the present smaller scale mans 3. A number of shafts and darts are siowry on the map as isolated features xhicn lack extent -of- mining outlines. Tne ia.s of outlines is because, either there were 110 maps on file for the mines, or because the shafts and 4dits were mere prospects Anse outlines are too small to snow at the scale of the x D. areas around these snafts and adits should be considered as possibly undermined. 4. The description of a particular problem area is based on conditions existing at the time of the field visit to that site. 0 ® 4`2 rILtI l .. .. .c` a. 488000m.E. m. „A, 105 °07'30" ROAD CLASSIFICATION o Medium duty Light -duty OPT Unimproved dirt COLORADO • Canon City Coal Field QUADRANGLE LOCATION ' ROCKVALE, COLO. N3815- W10507 5/7 5 1959 AMUEDO AND IVEY Denver, Colorado MINES PROBLEM AREAS EXTENT OF MINING MAP Coal - underground mine O Mine subsidence DRAFTING , Coal - strip mine �2 Mine opening CONTOUR INTERVAL DRAWING NO. Jan. 31, 1981 I :24,000 20' � Hoist shaft Mine fire D Air shaft t Adit or incline 4O Mine drainage ROTES I. All mines shown on this map were visited 'n Me field and the actudl or WtentIdi nards associated moth them were evaluated at tnat time These include mine openings, mine fires, and nine drainage. Alin regar( to simsidence it - should be noted that tbe map shows Only existing subsidence features rather than areas of potential subsidence. The latter can only be determined by site - specific studl es. 2. The mine outlines shown on this map are based )n original mine maps and surveys on flee at the - , :or,do Division of Mines and the Colorado State Archives and Records Office There may be minor inaccuracies in the mine outlines either because of inaccuracies in the original surveys or because of small discrepancies generated during the transfer Of the outline, Rom the large scale - original maps to the present smaller scale mans 3. A number of shafts and darts are siowry on the map as isolated features xhicn lack extent -of- mining outlines. Tne ia.s of outlines is because, either there were 110 maps on file for the mines, or because the shafts and 4dits were mere prospects Anse outlines are too small to snow at the scale of the x D. areas around these snafts and adits should be considered as possibly undermined. 4. The description of a particular problem area is based on conditions existing at the time of the field visit to that site. 0 ® 4`2 rILtI l .. .. .c` a. 488000m.E. m. „A, 105 °07'30" ROAD CLASSIFICATION o Medium duty Light -duty OPT Unimproved dirt COLORADO • Canon City Coal Field QUADRANGLE LOCATION ' ROCKVALE, COLO. N3815- W10507 5/7 5 1959 AMUEDO AND IVEY Denver, Colorado FOR: INACTIVE MINE RECLAMATION PROGRAM Colorado Department of Natural Resources EXTENT OF MINING MAP Showing associated hazards and subsidence features ROCKVALE QUADRANGLE GEOLOGY R.E. Marbury A.R. Myers DRAFTING , H.A.H. Schlender DATE SCALE CONTOUR INTERVAL DRAWING NO. Jan. 31, 1981 I :24,000 20' 8007-14