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  Mine Waste Technology Program, Remediation Technology Evaluation at the Gilt Edge Mine, South Dakota (EPA/600/R-05/002) November 2004

This document reports the findings of the Mine Waste Technology Program's Activity III, Project 29, the Remediation Technology Evaluation Project at the Gilt Edge Mine, South Dakota. This project consisted of evaluating three emerging acidic waste rock stabilization technologies and comparing those technologies to lime treatment of acidic waste rock.

The three new technologies tested were the Silica Micro Encapsulation from Klean Earth Environmental Company, Passivation from the University of Nevada-Reno, and Envirobond from Metals Treatment Technologies.

Performance of the technologies was evaluated as a pilot-scale demonstration by placing treated waste rock into isolated cells at the Gilt Edge Mine and monitoring the leachate collected from the representative cells. The objective of the treatments was to reduce the contaminants of concern by at least 90 percent or to meet South Dakota water discharge limits. The three technology vendors provided a cost estimate to treat a hypothetical 500,000-cubic yard waste rock pile at the Gilt Edge Mine, using the pilot-scale data as a guideline.

The leachate results revealed that Passivation and lime treatment reduced more contaminants of concern to the project objectives than Silica Micro Encapsulation or Envirobond.

Appendices A through D are available upon request (refer to document number MWTP-235):

(406) 494-7100


Norma Lewis

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