2008-08-06_REVISION - C1982057

• Permit No: C1982057
• IBM Index Class Name: REVISION
• Doc Date: 8/6/2008
• Doc Name: Midterm Review Reclamation Cost Estimate
• From: DRMS
• To: Seneca Coal Company
• Type & Sequence: MT5
• Email Name: DTM
• Media Type: D
• Archive: No

HOURLY PRODUCTION sheet 2 of 2
Hauling Capacity :
Scraper Payload (weight) Basis : Scraper Bowl (volume) Basis :
--------------
Material weight:-- 2,100 pounds/LCY
Material description : T
Earth - Loam
Rated payload. 75,000 pounds
Payload capacity : 35.71 `LCY
Struck volume : 24.00
_ LCY
m
Heaped volume : 34.00 LCY
Average volume : 29.00 LCY
Adjusted capacity : 29.00 LCY •"
hourly production reflects volume per scraper pair on push-pull models
Cycle Time : Job Condition Corrections : Site altitude (t): 8,000
Scraper Push dozer Source
Scraper loading time 1.00 minutes - Altitude adj.:, 0.980 ! NA I
._....
---
---- (Cat HB)

Maneuver and spread time : 0.60 minutes

Job efficiency .4

0.830 -
-
-
NA -----_-..-----.....
--
(Cat HB)
' load time per scraper pair on push-pull models Net correction : 0.813 NA
Travel time :
Road condition description : Firm, smooth, rolling, dirt/!t. surfaced, watered, maintained
_...__.
___._._....___...........
Haul Route :
Seg. # ? Haul distance (feet) Grade (%) j Roll. res. Total res. (%) Velocity (fpm) 1 Travel time
1 3,000 2.00 3.00 5.00 1867 1 1.73
Return route :
Haul time : 1.73 minutes
" travel time for each segment is adjusted for acceleration/deceteration. Return time : f,14 minutes
table velocities are max attainable
per total resistance shown, not average .......... ...•_-
Total scraper team cycle time (load + haul + maneuver and spread + return) : 4.47 minutes
Unadjusted unit production/hour : 778.57 LCY/hour Adjusted for job conditions : 633.29 LCY/hour
Optimal number of scrapers per push dozer : NA Selected number of scrapers : 2 scraper(s)
Adjusted single scraper team (unit) hourly production : 633-29 LCY/hour
Adjusted multiple scraper team (fleet) hourly production : 1,266.5$ LCY/hour