Reports of the Inspectors of Mines of the anthracite and bituminous ...

76 Eeports of the Inspectors of 31ines. [Off. Doc.
mine is situated, and the surveys of the face of the workings alono- such
pillar shall be made in duplicate and must practically agree."
In order to comply with this provision J. F. Snyder, chief miningengineer
of the Delaware, Lackawanna and Western Railroad Company,
J. H. Bowden, chief mining- engineer of the Susquehanna Coal Company,
W. J. Eichards, chief mining- engineer of the Lehigh and Wilkesbarre
Coal Company, and G. M. Williams, mine Inspector of this district, met
and agreed that all the said pillars as far as related to their companies
should be in accordance with the following terms and formulas
Agreement
In compliance with the requirements of section ten, article three of the
act of June 2, 1891, entitled " An act to provide for the health and safety
of persons employed in and about the anthracite coal mines of Pennsylvania,
and for the protection and preservation of property connected
therewith," it is hereby agreed between the engineers of the
and of and the Inspector of mines of the
Anthracite district of Pennsylvania, that the barrier pillars to be left,
one-half {\) by each owner, between the workings
on their adjoining properties, are to be, as nearly as practicable, of the
thickness to be determined as follows :
First. That after this date the width of barrier pillar between the
workings of adjacent properties is to be five times the thickness of seam
mined out fi-om floor to roof at the water drainage level ; and that at all
points below such level its width shall be equal to the thickness mined
out at that point multiplied by one per cent, of the depth below drainage
level added to five times the said thickness mined out. Thus
Thickness of workings X one per cent, of depth below drainage level +
thickness of workings X 5 = width of barrier pillar. And as further
illustrated by the attached table of pillars to be left between adjoining
mines of different thicknesses of workings at difl'erent depths.
Second. That the water drainage level shall be understood to mean the
level at which Avater would drain ofi" from any abandoned workings, and
that where the level is higher in one mine than in an adjoining one the
higher level shall be taken, and where there is but one mine opened it
shall determine its drainage level, and if the drainage level of a mine
subsequently opened upon adjoining lands is higher, the additional
thickness required shall be left by the owner of said mines.
Third. That these thicknesses shall be subject to such modifications
as may be deemed advisable under varying conditions of the strata and
seams due to proximity of other seams, faulty nature of seam or strata
or other conditions shown by the development of the workings.
Fourth. That on notice of either party that any modifications of this
agreement are desirable a meeting shall be forthwith held to decide the
same.
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