Foreman, D. H.

Antique Plans Hidden Treasure Mine Lake City, Colorado

Antique Plans Hidden Treasure Mine Lake City, Colorado. Hinsdale County.

DESCRIPTION: The most interesting set of gold mining plans I have seen!

A very absorbing pair of fine antique presentation plans for the Hidden Treasure Mine at Lake City, in Hinsdale County, Colorado between Crystal Creek and Ute Creek. The Hidden Treasure Mine (1897-1922) was a gold, silver, lead, and copper mine located at an elevation of 10,200 feet.

Both plans are hand-colored blue-line artifacts on architectural vellum. Plan 1 includes:
  • Fig 1. Plan Map of the Hidden Treasure Property
  • Fig 2. Longitudinal Section of Slope of Vein Looking West.
  • Fig 3. Plan of Underground Workings.
Plan 2 includes:
  • Fig 4. Longitudinal Section Underground Workings. Looking West.
  • Fig 5. Cross-section Through "X-Y" (Plate 1) Looking S.W.
  • Sampling data and ore valuation table.
Dated within to 12/20/16. Drawn by D.H. Foreman, Denver, Colorado.

The old Hidden Treasure Dam on Henson Creek, built in the 1890's, made the news in late May, 2019. It was announced that the dam was to be demolished because of the concern for flash floods associated with the potential for sudden heavy snowmelt. (Source:

On Fig 1. Plan Map of the Hidden Treasure Property two tunnels are shown leading to the Lower Terminal Mill. More than 100 years old, the Hard Tack Mine tunnel was built as an underground transport tunnel for the Hidden Treasure Mining Company's ore production one quarter mile up the mountain (shown here as "proposed"). The Hardtack Mine now (2024) houses a museum designed to preserve area mining history and offers tours June to September.

CREATOR: Foreman, D. H.




CONDITION: Very Good.  On strong, supple architect's vellum or tracing cloth with careful hand coloring. Some few spots and minor grime from handling near the left and right edges. Otherwise very nice.

COLORING: Hand color.


SIZE: 38 " x 25 "


PRICE: $3250


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