The records of the Humming Bird Mining Company span the years 1898 to 1936. Included are minutes of meetings, monthly and yearly financial statements, maps, claims, leases, deeds, correspondence with suppliers and stockholders, reports to state and federal agencies, stock ledgers, assessment records, cash journals, invoices, check registers, bank statements, paid checks, and federal and state tax returns.

Related materials can be found in the records of the Hercules Mining Company and the papers of Henry Day.