Technology Transfer at Edgar Mine: Phase 1; October 2016

Chad Augustine, Stephen Bauer, Masami Nakagawa, Wendy Zhou

Research output: NRELTechnical Report


The objective of this project is to study the flow of fluid through the fractures and to characterize the efficiency of heat extraction (heat transfer) from the test rock mass in the Edgar Mine, managed by Colorado School of Mines in Idaho Springs, CO. The experiment consists of drilling into the wall of the mine and fracturing the rock, characterizing the size and nature of the fracture network, circulating fluid through the network, and measuring the efficiency of heat extraction from the 'reservoir' by monitoring the temperature of the 'produced' fluid with time. This is a multi-year project performed as a collaboration between the National Renewable Energy Laboratory, Colorado School of Mines and Sandia National Laboratories and carried out in phases. This report summarizes Phase 1: Selection and characterization of the location for the experiment, and outlines the steps for Phase 2: Circulation Experiments.
Original languageAmerican English
Number of pages109
StatePublished - 2017

NREL Publication Number

  • NREL/TP-6A20-66553


  • Edgar Mine
  • EGS
  • fracture characterization


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