2007-12-19_REVISION - C1981010

• Permit No: C1981010
• IBM Index Class Name: REVISION
• Doc Date: 12/19/2007
• Doc Name: Adequacy Concerns & Cost Estimate
• From: DRMS
• To: Trapper Mining Inc
• Type & Sequence: RN5
• Media Type: D
• Archive: No

HOURLY PRODUCTION sheet 2 of 2
Hauling Capacity :
Scraper Payload (weight) Basis : I Scraper Bowl (volume) Basis :
Material weight
Material description
Earth - Dry packed
Rated payload
Payload capacity
Cycle Time :
2,550 pounds/LCY Struck volume : 24.00 LCY
Heaped volume : 34.00 LCY
Average volume : 29.00 LCY
75,000 pounds Adjusted capacity : 29.00 LCY'**
29.41 LCY hourly production reflects volume per scraper pair on push-pull models
Scraper loading time * : 1.00
Maneuver and spread time : 0.60
* load time per scraper pair on push-pull models
Job Condition Corrections : Site altitude (ft.) : 7,000
Scraper Push dozer Source
minutes Altitude adj.: 1.000 NA (Cat HB)
minutes Job efficiency : 0.810 NA (Cat HB)
Net correction : 0.810 NA
Travel time :
Road condition description : Rutted dirt, little maintenance, no water, 2" tine penetration
Haul Route :
Seg. # Haul distance (feet) Grade (%) Roll. res. (%) Total res. (%) Velocity (fpm) Travel time (min.)**
1 700 3.00 3.00 6.00 1477 0.56
2 1,200 5.00 5.00 10.00 922 1.23

Haul time : 1.79 minutes
Return route :
1 1,200 -5.00 5.00 0.00 2965 0.52
2 700 -3.00 3.00 0.00 2965 0.24

" travel time for each segment is adjusted for acceleration/deceleration. Return time : 0.75 minutes
table velocities are max. attainable per total resistance shown, not average
Total scraper team cycle time (load + haul + maneuver and spread + return) : 4.14 minutes
Unadjusted unit production/hour : 840.79 LCY/hour *** Adjusted for job conditions : 681.04 LCY/hour
Optimal number of scrapers per push dozer : NA Selected number of scrapers : 2 scraper(s)
Adjusted single scraper team (unit) hourly production : 681.04 LCY/hour
Adjusted multiple scraper team (fleet) hourly production : 681.04 LCY/hour