Wall Street Assay Office (Boundary Increase)

Listed on the National Register of Historic Places in 1992.

From the record

One of 92 National Register listings published here for Boulder County · listed in 1992 · category: Building.

Sources: the case file at the National Archives · the National Register database, National Park Service

The listing

What is counted as historic. The nomination lists 1 building as contributing to the listing.
Address. Area W and across Wall St. from Assay Office, Wall Street, 80466
When was it listed? January 1992
Category. building
Also known as. Metal Mining and Tourist Era Resources of Boulder County MPS; Metal Mining and Tourist Era Resources of Boulder County MPS
Census division. Bald Mountain
National Register reference number. 91002028 - the number the National Park Service assigned this property when it was listed, and the key its nomination file is catalogued under at the National Archives.

Fires near this property

18 since 1992

Regional context, not property-specific evidence. The federal wildfire occurrence database lists 18 fires within 5 miles of Wall Street Assay Office (Boundary Increase) between 1992 and 2020, burning about 2 acres in total. 6 started naturally. None was recorded as arson. Distance is straight-line from the map coordinates, so a fire counted here may appear on a neighbouring settlement's page as well.

Reported cause	Fires
Missing data/not specified/undetermined	7
Natural	6
Recreation and ceremony	5

The most recent of them, most recent first, with the day each was reported and the service that recorded it.

Date	Cause	Size	Reported by	Name on the report
9 September 2017	Natural	under an acre	Arapaho and Roosevelt National Forests and Pawnee National Grassland	JASPER LAKE
5 September 2016	Missing data/not specified/undetermined	under an acre	Nederland Fire Protection District	UNKNOWN
23 September 2015	Missing data/not specified/undetermined	under an acre	Nederland Fire Protection District	UNKNOWN
22 September 2007	Recreation and ceremony	under an acre	Arapaho and Roosevelt National Forests and Pawnee National Grassland	CARIBOU 2
17 September 2020	Missing data/not specified/undetermined	under an acre	Arapaho and Roosevelt National Forests and Pawnee National Grassland	MITCHELL LAKE
14 September 1996	Recreation and ceremony	under an acre	Arapaho and Roosevelt National Forests and Pawnee National Grassland	LITTLE RAVEN
24 August 2008	Recreation and ceremony	under an acre	Arapaho and Roosevelt National Forests and Pawnee National Grassland	COLUMBINE LAKE
17 August 1996	Natural	under an acre	Arapaho and Roosevelt National Forests and Pawnee National Grassland	LAKE ISABELLE

Every fire recorded in Boulder County

Mines and quarries near this property

10 of 65 shown

Regional context, not property-specific evidence. The federal mineral resources record lists 65 workings within 5 miles of Wall Street Assay Office (Boundary Increase): 24 occurrences, 23 past producers, 16 producers, 2 unknowns. 16 still produce. What was taken out: Gold, Silver, Copper, Uranium. Distance is straight-line from the map coordinates, so a quarry counted here may appear on a neighbouring settlement's page as well.

Site	Commodity	Status	Recorded
Anchor	Gold, Copper, Lead, Silver	Past Producer
Belcher	Silver, Gold, Lead, Copper	Past Producer	Galena, Sphalerite, Chalcopyrite, Pyrite
Caribou Hill iron deposit	Iron, Titanium, Vanadium	Occurrence	Ilmenite, Magnetite, Titaniferous Magnetitite
Caribou Mine	Gold, Lead, Silver, Uranium, Copper, Zinc, Vanadium	Past Producer	1869
Columbia	Gold, Copper, Zinc, Lead, Silver	Past Producer
Comstock	Zinc, Silver, Lead, Gold, Copper	Past Producer	1911
Cross Mine	Zinc, Lead, Silver, Gold, Copper	Past Producer	Silver
Grand Island-Caribou District	Gold, Lead, Silver, Copper, Zinc, Titanium, Uranium	Past Producer	Argentite, Chalcopyrite, Galena, Pyrargyrite, Silver, Sphalerite, Titaniferous Magnetitite, Pitchblende, Cerargyrite
Grant County	Gold, Lead, Silver	Past Producer
Great Northern	Silver, Gold, Lead, Uranium, Zinc	Past Producer

Every working recorded in Boulder County

Map coverage status

No historic map-sheet match is published for this property yet. That does not mean no map exists. This record needs a coordinate-quality review before it can be joined to a sheet boundary. Browse the county's mapped places while that work is pending.

Listed places nearby

6 within 8 miles

Other National Register properties close enough to walk or drive between, ordered by distance from this one. Both positions come from the same geocoding pass that matched these properties to their map sheets.

Property	Distance	Listed
Wall Street Assay Office	under 500 feet	1989
Buchan Cabin	4.9 miles	2020
Ward School	6.7 miles	1989
Ward Congregational Church	6.7 miles	1989
Modoc Mill	6.7 miles	1978
Eldora Historic District	6.8 miles	1989

Sources for this property

National Archives record	The nomination case file for reference 91002028 in Record Group 79.
Boulder County	All 92 listed properties in this county.

Provenance

Listing record. National Park Service National Register of Historic Places, listed-properties dataset, current to 2026-05-22.
Map join. Address geocoded through the United States Census geocoder, then tested against the published boundary of every sheet in the USGS Historical Topographic Map Collection.
How this page is made. Listing fields come from federal records; map-sheet coverage is a labelled coordinate-to-boundary calculation, not a source-field claim.
Wildfire. Short, Karen C. 2022. Spatial wildfire occurrence data for the United States, 1992-2020 [FPA_FOD_20221014]. 6th Edition. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2013-0009.6 Collected with United States Government funding and usable without additional permissions or fees.
Mines and quarries. USGS Mineral Resources Data System (MRDS) https://mrdata.usgs.gov/mrds/ A work of the United States government, no copyright under 17 U.S.C. 105.