Lake Valley Mine Safeguard Project - Phase II

Lake Valley mill as it was in the 1880's Lake Valley mill as it looks today

The Lake Valley Mine Safeguard Project - Phase II area is located in and around the ghost town of Lake Valley, seventeen miles south of the town of Hillsboro, in Sierra County, New Mexico. The project area is on private land.

The project site consists of 58 abandoned mine openings, all of which were dangerous to the public at large.

To the maximum extent practicable, construction access is limited to existing jeep trails and roads, except as otherwise shown, specified, or allowed by the Project Manager.

This project will involve the following work:

  • Backfilling of 24 mine openings using mine waste, other nearby material and material imported from designated borrow areas where specified. Blasting is allowed at one designated mine opening and as otherwise allowed by the Project Engineer.
  • Construction of bat gates in six adits and one stope opening, including one placed inside a rock bulkhead, one inside a polyurethane foam (PUF) plug, one with a cast-in-place concrete plug and three inside toroid tire plug closures, all with corrugated steel pipe culverts.
  • Construction of airflow closures with corrugated steel pipe risers inside polyurethane foam (PUF) plugs with precast concrete units and concrete collars at two shafts, and construction of a grated airflow closure into an existing concrete collar at one shaft.
  • Construction of horizontal bat compatible closures at two shafts with corrugated steel pipe risers, precast concrete units and concrete collars, and including a PUF plug at one of those shafts and a large toroid tire plug at the other.
  • Construction of bat cupolas at two shafts, one with a polyurethane foam plug, corrugated steel pipe riser, scoria fill, precast concrete units and concrete collar and one with a concrete footing placed on a cast-in-place concrete hollow core plug.
  • Construction of a polyurethane foam plug closure, with PVC drainpipe, steel sleeve and grated cover, at one shaft.
  • Construction of large toroid tire plug closures at nine shafts, one adit and one stope opening with small toroid mats and geotextile mesh and cloth.
  • Construction of a corrugated steel pipe column plug at one stope opening.
  • Construction of steel mesh airflow closures with rock anchors at five shafts and an underground powder house including placement of boulders as a barrier around one of the shafts.
  • Construction of a welded wire fence with barbed wire along a highwall.
  • Construction of a steel grate at a mill hopper opening.
  • Closure of temporary construction access roads.
  • Seeding of all areas disturbed by construction.

The engineer's estimate for this project was between $500,000 and $750,000.

You can view the project manual by clicking on the links below. Site location maps (figures 2-9) are purposely not included.
ADDENDUM No. 1 (Added March 21, 2007)
Contract Information
General Requirements and Sitework
Concrete Specifications
Metals Specifications
Miscellaneous Specifications

Drawings and Figures
Figure 1 Figure 19 Figure 29 Figure 39 Figure 49
Figure 10 Figure 20 Figure 30 Figure 40 Figure 50
Figure 11 Figure 21 Figure 31 Figure 41 Figure 51
Figure 12 Figure 22 Figure 32 Figure 42 Figure 52
Figure 13 Figure 23 Figure 33 Figure 43 Figure 53
Figure 14 Figure 24 Figure 34 Figure 44 Figure 54
Figure 15 Figure 25 Figure 35 Figure 45 Figure 55
Figure 16 Figure 26 Figure 36 Figure 46 Figure 56
Figure 17 Figure 27 Figure 37 Figure 47  
Figure 18 Figure 28 Figure 38 Figure 48  
   

Photos typical of the landscape

 
Typical Landscape Another photo of the typical landscape
Waste rock for Feature 082 waste rock right and waste rock Feature 083 left  
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