HOCKING VALLEY COAL FIELD. 935 
Comparing these two sections of the seam on the opposite sides of 
the dividing ridge, we find the following facts: 
Moxahala Section. Sunday Creek Section. 
SEP Ridenseamlnccccascescens: 30 in. 
Uo Third slate............ Aas 
Gyn Top coal rseiee lccesss 42 “ 
Black slate. Thin parting. 
De DONE COM eae ae wesc sesoevecsate: 22 in. 5. Bone coal ..... eRe aac 24 ‘ 
4. False roof (second slate) 4 “ 4, Second slate (2-4)... 2 “ 
3. Top coal (middle bench)..... 8 “ 3. Middle bench (4-6) ...... Gs 
2. Hinsti Slatebacrscsc<cesesees tee 2. HInStaslatessccadecesates FANS: 
iy Wowenlbenchy-c...-2sscasc. <1. 26 “ Imo wenmbencltressassssces 30 “ 
The lower five elements of the two sections are seen to be substan- 
tially identical. In other words, the normal Middle Kittanning seam 
is present as an integral and unmistakable part of the “Great Vein.” 
It constitutes the lowermost five feet of the Corning seam. It is 
somewhat changed in character from the northern phase, but chiefly 
in respect to the percentage of sulphur. There is a small reduc- 
tion in the volatile matter and a corresponding increase in fixed carbon, 
but the change is but slight at the point where the present comparison 
is made. The formation of the thick coal of Corning is thus seen to 
be due to the superposition of two distinct benches of coal, aggregating 
6 feet in thickness upon the normal seam. In other words, its compo- 
sition is as follows: 
Hockinom\Valleyasupplementin sneer ete ners ten Medes ecsidcessitenee 6 feet. 
INormaleMid dl esksittanmingscoaluecr es asesceenscscc noes ceccteec cae edeeseecnencs 5 feet. 
The statements now given cover the main points of interest so far 
as the normal or undisturbed coal is concerned. A few additional facts 
will be given as to the several] mines. ) 
Mine No. 3 has been worked more steadily and largely than any 
other of the field. Its coal is preferred in market by reason of the fact 
that it is more thoroughly cleaned than that of the adjacent mines, the ° 
screen bars over which it passes being 13 inches apart. The nut coal 
is also more salable. All the coal comes out wet, and to accomplish its 
effectual cleaning, certain unusual stops are attached to the screens. 
This is the only mine in the valley in which colored miners are 
exclusively employed. : 
Mine No. 5, known as Rend’s mine, has by lease 50 acres of un- 
broken coal, so far as workings have yet advanced. It is the only mine 
