This will be an ever-growing glossary as we use words on the site that may not be familiar to the reader, whether by reason of historic usage, mining lingo or otherwise.
Jack Dunn and Tony Rucker grubstaked George Warren to go to the Mule Mountains and locate (see definition below) more mining claims. They provided the wherewithall, whether cash or supplies, for him to survive while he did the work. In return, he was to put their names, as well as his, on the claim documents he would file in Tucson.
A process described in federal Mining Law defining how a prospector would mark the boundaries and center of an area of public land he believed contained valuable minerals.