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National and State Register
The Matchless Mine is significant for industry and social history as a working silver mine and for its association with Horace Austin Warner Tabor from 1879 to 1899, and with Elizabeth "Baby Doe" Bonduel McCourt Tabor form 1901 to 1935.
Additionally, the surface plant of Shaft No. 6 located on the property is significant for its architecture and engineering. Finally, the mine and its shaft is significant for Historic Archaeological and Engineering for its potential to yield information important to history or prehistory.