Report of the Bureau of Mines of the Department of Internal Affairs of ...

No. 10. MINING LAWS OF PENNSYLVANIA. xciii
First. All lucasuremenrs of said mine in feet or decimal parts
thereof.
Second. All the oi^enings, excavations, shafts, tunnels, slopes, planes,
main-entries, cross-entries, rooms, et cetera, in proper numerical order
in eiich opened strata of coal in said mine.
Third. By darts or arrows made thereon by a pen or pencil the direction
of air currents in said mine.
Fourth. An accurate delineation of the boundary lines between
said coal mine and all adjoining mines or coal lauds, whether owned
or operated by the same operator or other operator, and the relation
and proximity of the workings of said mine to every other adjoining
mine or coal lands.
Fifth. The elevation above mean tide at Sandy Hook of all tunnels,
and entries, and of the face of working places adjacent to boundary
lines at points not exceeding three hundred feet apart.
Sixth. The bearings and lengths of each tunnel or entry, and of the
boundary or property lines. The said map or plan, or a true copy
thereof,
shall be kept in the general mine office by the said operator
or superintendent for use of
the mine inspectors and for the inspection
of any person or persons working in said mine whenever said
person or persons shall have cause to fear that any working place is
becoming dangerous by reiison of its proximity to other workings
tliat may contain water or dangerous gas.
Section 2. At least once in every six months, or ofteuer if necessary,
the operator or superintendent of each mine shall cause to be
shown accurately on the map or plan said coal mine, all the excavations
made therein during the time elapsing since such excavations
were last shown upon said map or plan; and all parts of said mine
which were worked out or abandoned during said elapsed period of
time shall be clearly indicated by colorings on said map or plan, and
whenever any of the workings or excavations of said coal mine have
been driven to their destination, a correct measurement of all such
w^orkings or excavations shall
be made promptly and recorded in a
survey book i)rior to the removal of the pillars or any part of the
same from such workings or excavations.
Section 3. The operator or superintendent of every coal mine shall,
within six months after the passage of this act, furnish the mine inspector
of the district in w^hich said mine is located w^ith a correct
copy on tracing muslin or sun print, of the map or plan of said mine
hereinbefore i)rovidftd for. And the inspector of the district shall,
at the end of each year or twice a year if he requires it, forward said
map or plan to the proper person at any ptarticular mine, whose duty
it shall be to place or cause to be placed on said map or plan iill extensions
and worked out or abandoned parts of the mine during (he
preceding six or twelve months, as the case may be, and return I
he