2009-08-06_REVISION - C1982056 ‎(2)‎

• Permit No: C1982056
• IBM Index Class Name: REVISION
• Doc Date: 8/6/2009
• Doc Name: Expansion Adequacy Concerns & Attached Cost Estimate
• From: DRMS
• To: Twentymile Coal Company
• Type & Sequence: TR67
• Email Name: JHB
• Media Type: D
• Archive: No

HOURLY PRODUCTION
Hauling Capacity :
Scraper Payload (weight) Basis :
sheet 2 of 2
Material weight : 2,550 pounds/LCY
Material description
Earth - Dry packed
Rated payload : 104,000 pounds
Payload capacity: 40.78 LCY
Cycle Time :
Scraper loading time * : 1.10 minutes
Maneuver and spread time : 0.60 minutes
* load time per scraper pair on push-pull models
Travel time :
Road condition description :Firm, smooth, rolling
Haul Route :
Scraper Bowl (volume) Basis :
Struck volume : 32.00 LCY
Heaped volume : 44.00 LCY
Average volume : 38.00 LCY
Adjusted capacity : 38.00 LCY "**
hourly production reflects volume per scraper pair on push-pull models
Job Condition Corrections : Site altitude (ft.) : 7,000
Scraper Push dozer Source
Altitude adj.: 1.000 NA (Cat HB)
Job efficiency : 0.830 NA (Cat HB)
Net correction : 0.830 NA
dirtIlt. surfaced, watered, maintained
Seg. # Haul distance (feet) Grade (%) Roll. res. (%) Total res. (%) Velocity (fpm) Travel time (min.)**
1 1,200 2.70 3.00 5.70 1908 0.79

Return route :
Haul time
travel time for each segment is adjusted for acceleration/deceleration. Return time
table velocities are max. attainable per total resistance shown, not average
Total scraper team cycle time (load + haul + maneuver and spread + return)
Unadjusted unit production/hour : 1,518.02 LCY/hour *** Adjusted for job conditions
Optimal number of scrapers per push dozer : NA Selected number of scrapers
Adjusted single scraper team (unit) hourly production
Adjusted multiple scraper team (fleet) hourly production
0.79
0.51 minutes
0.51 minutes
3.00 minutes
1,259.96 LCY/hour
2 scraper(s)
1,259.96 LCY/hour
3,779.87 LCY/hour
Total job time : 92.18 Hours
Total job cost : $268,763