Silver Cycle Mine Remediation


Location

the Silver Cycle Mine Remediation project is located on Gilson Gulch, approximately 1/2 mile north of Gilson Avenue and Riverside Drive in Idaho Springs

the Silver Cycle Mine Remediation project is located on Gilson Gulch, approximately 1/2 mile north of Gilson Avenue and Riverside Drive in Idaho Springs

Outfall channel construction.

Outfall channel construction.

Silver Cycle Mine Waste along Gilson Gulch

Silver Cycle Mine Waste along Gilson Gulch

Summary

A full suite of reclamation activities were conducted at the Silver Cycle Mine, located approximately 1 mile upstream of the outlet of Gilson Gulch, near Idaho Springs. Project elements involved:

  • installing a proper closure for the mine adit in accordance with DRMS specifications;
  • routing the Silver Cycle drainage to Gilson Gulch in an impermeable lined channel to prevent further leaching of mine waste contaminants from the mine drainage;
  • removing mine waste from both sides of Gilson Gulch, which is in the floodway of the channel;
  • stabilizing the channel of Gilson Gulch so that it can pass a storm flow with a 25 year recurrence interval without any erosion of mine waste in the Silver Cycle area;
  • consolidating the mine waste pile within the existing footprint of the pile; grading and shaping the mine waste to promote runoff and prevent infiltration into the pile;
  • topsoiling the mine waste; and
  • revegetating the disturbed areas at the Silver Cycle and Euphrates mine claim sites with native plant materials (seed mix).


Water quality benefits have been obtained from:

  1. Preventing infiltration of the mine drainage into the waste pile;
  2. Preventing precipitation-caused erosion and runoff from the mine waste material from contaminating Gilson Gulch; and
  3. Removal of mine waste from the Gilson Gulch channel.

Read the Final Project Report, and view a map of the project area.

The silver Cycle Mine opening, before and after closure was added.

The silver Cycle Mine opening, before and after closure was added.