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Collaborating Authors
Carlson, Norman
A multimethod approach for deep-tunnel detection using near-surface electrical geophysics at a gold-mine remediation site
Pendrigh, Nicole (Zonge International, Inc.) | Sirles, Phil (Zonge International, Inc.) | Carlson, Norman (Zonge International, Inc.) | LaBrecque, Douglas (Multi-Phase Technologies) | Ivancie, Paul (AMEC)
At the Captain Jack Superfund site located four miles southwest of Ward, Colorado, acid mine drainage is trickling in to Left Hand Creek, which flows in to Boulder, Co (Figure 1). The water needs to be treated and monitored. The proposed solution is to use the mine tunnels for in-situ water treatment. Therefore, there is a need to determine the location of the mine tunnel system, if possible. There is limited information regarding the extent of mineworkings and bedrock fractures through the reservoir zone of the Big Five tunnel. While these areas are accessible for tracked drilling rigs, some tunnel segments lie 400 to 500 feet underground. Because the historical maps of mine/tunnel workings have no survey data, locating the tunnel "target zones" either involves drilling holes on 5 to 10-footspacings across multiple transects, or utilizing geophysical methods to detect/locate the tunnel voids prior to drilling. Surface applications of geophysics such as electrical resistivity (ER) are recommended to obtain subsurface “imaging” of the tunnel locations. The benefit of ER methods is that they minimize the number of drill locations and per-foot drilling expense, as well as resulting surface disturbance requiring reclamation. Surface and crosshole geophysical investigations, including time-domain dipole-dipole resistivity and frequency domain Mise-a-la-Masse (MALM) surveys, were conducted on the Captain Jack Project Since the geophysical surveys were completed in 2012, the site has undergone downhole Electical Resistivity Tomography (ERT) and Magnetics monitoring and modelling. The bulkhead and remediation pumping system is in place as of summer, 2017. Surface and borehole monitoring equipment is in place, and in the near-future, the valve will be closed and in-place monitoring will begin. Presentation Date: Thursday, October 18, 2018 Start Time: 8:30:00 AM Location: 204A (Anaheim Convention Center) Presentation Type: Oral
- Government > Regional Government > North America Government > United States Government (0.50)
- Materials > Metals & Mining > Gold (0.41)
Abstract Induced-polarization (IP) effects in electrical geophysical surveys have been used in mineral-exploration projects for many decades, but only in the past 15 years or so has IP in environmental geophysics become a more common, commercially applicable method. This is primarily because of improvements in the economics of the technique and in data quality resulting from equipment advances. One field of environmental applications in which the IP method has been particularly useful is the study of buried waste. In the past, IP data acquisition was relatively expensive, and as a result, many landfill IP surveys were limited in scope for budgetary reasons. With the improving economics of the method, however, extensive amounts of data have been acquired at more than 50 landfills. At one site alone, 95 lines of IP and resistivity data were acquired, and at another, more than 14,000 transmitter-receiver pairs were used. Examination of this large, diverse data set allows several interesting general conclusions to be drawn that were not evident from the more limited surveys in the past. For example, early interpretations of IP results over landfills assumed that the IP effect was primarily the result of metallic debris in the waste. However, from the large database over many landfills, it appears that multiple sources of the IP effect are associated with the waste, and IP anomalies are clearly evident over landfills that contain little or no metal. It is also clear that IP surveys are substantially more reliable than other more traditional waste-mapping methods such as resistivity (or its inverse, conductivity) and magnetics. In addition, comparisons of data sets over time suggest that the IP method might be a useful tool in monitoring the degradation of subsurface waste.
- Water & Waste Management > Solid Waste Management (1.00)
- Energy > Oil & Gas > Upstream (1.00)
- Government > Regional Government > North America Government > United States Government (0.46)
- North America > Canada > Alberta > Clearwater Field > Mobil Clearwater 5-1-36-13 Well (0.98)
- Oceania > Australia > Victoria > Murray Basin (0.93)
- Oceania > Australia > South Australia > Murray Basin (0.93)
- (4 more...)
Memorials
Hughes, Larry, Zonge, Lynn, Van Reed, Emmett, Carlson, Norman, Lide, Chet, Urquhart, Scott, Wynn, Jeff, Young, Gary N., Roth, Jerry
Memorials for: Kenneth Zonge
- North America > United States > Pennsylvania (0.24)
- North America > United States > Ohio (0.24)
- North America > United States > Alaska (0.16)
- Materials > Metals & Mining (0.89)
- Energy > Oil & Gas (0.70)
Fluid-flow mapping at a copper leaching operation in Arizona
Carlson, Norman (BHP Copper) | Zonge, Kenneth (BHP Copper) | Ring, George (BHP Copper) | Rex, Martin (BHP Copper)
At the San Manuel copper mine in southeastern Arizona, recovery of copper from the oxidized portion of this porphyry mineral resource is being achieved through a large in situ leaching operation using weak sulfuric acid solution. In the past, this activity was coordinated with open pit and underground mining, but in today's economic climate only the in situ operation continues. The acid solution (20 grams/liter) is injected into wells (unpressurized at varying depths up to several hundred meters), usually at rates of only a few tens of gallons per minute. The copper-bearing pregnant leach solution (PLS) is recovered either in nearby recovery wells or in collection areas in the underground workings 350–500 m below the surface.