952 GEOLOGY OF OHIO. 
The composition of the coal, as sampled from the entire seam, is as 
follows: 
Coal of Rock Run Mine (Lord). 
MOIS bP es. ces re hialce eres eee es Rete a ee OU ETE AMEE OLS 28 He) EOI 6.15 
Volatilexcombustilblemmattenrccsccocercc cere eee ee 38.53 
Fixed? CAL DON ee ee eo eS Ea 48.95 
IAS ocavats enki yieeis oa ebsie acoteere See e ee ea oe eee es Cea Oe AE EE EL a 6.37 
Botialins Loddiaeies ce k ec sees aioe Sistas are aiehctel ni Ta aie ees etetit a Bhar ena nemeie terse toca sear Sevan EO ORL 100.00 
Sal PUP i seewdsinsae onde sdeiieremcentenneds caida oateiicele wesne ste ae cteyeets oigelaae oeteaa war amen eiacaee —— 
This analysis is a little disappointing in the low percentage of 
fixed carbon, but it is to be remembered that it is the average of 9 feet 
of coal, of which 5 belong to the upper benches. 
The parting between the soft coal over the second slate and the top 
coal is thin but regular. It is the separating line between the normal 
and supplemental seams. ‘The soft coal runs as high as 12 inches at 
times, but it is often reduced to 4 or 5 inches. Two inches of horn 
coal or cannel are split out of the upper coal, the streak lying 18 
inches below the roof. The coal above the cannel is not taken down 
in entries nor in rooms, until pillars are drawn, when all comes out. 
Analysis was made of single samples from the lower bench, and 
also from the coal above the cannel, the results of which are given 
below: 
Composition of Coal from Rock Run Mine (Lord). 
1. Coal above the cannel. 
2. Coal from bottom bench. 
1 2. 
SIME cco NR IRRIRD  s ipe s oe N eaa 6.33 6.35 
Volatile combustible matter..........cccscccccserccccenss BAe yee Mune IA Ly 38.51 38.49 
f Ob:<(270 Wak Gr: ho] 010) 0 ES hh ee CU a Bee GAS Sic nbd GrbeTocda Gar 46.84 50.81 
PASI ice caeccewlclne cata biae bcc uae menace cae PsN Wich ea oes crs Aye a wee ST 8.32 . 4.35 
Poa bests Re eer RCL ee det RR 100.00 | 100.00 
STITT ABI? 409456000 bo0600cN0 00000006 10sb00000000009q500H00K0 3690d8Ad14300000020030200000|ococoso00005000] | 00000800000 
These figures, like those previously given, clearly indicate the effect 
of the top coal upon the output. The fixed carbon is reduced and the 
ash is increased by it. Wherever the seam is greatly thickened, a re- 
duction of quality is inevitable. 
