| http://www.w3.org/ns/prov#value | - That all the obligations of said leases, except as the Same may be herein modified or limited, shall be faithfully preserved and performed by said lessees, or those holding under them, and that no right shall be claimed or exercised in the lands covered by said leases or the surface thereof, except such as shall be proper and necessary for the profitable development and working of the mines therei
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