2013-04-29_REPORT - C1981014

• Permit No: C1981014
• IBM Index Class Name: REPORT
• Doc Date: 4/29/2013
• Doc Name: 2012 Annual Hydrology Report
• From: Energy Fuels Coal, Inc
• To: DRMS
• Annual Report Year: 2012
• Permit Index Doc Type: Hydrology Report
• Email Name: JHB
• Email Name: DIH
• Media Type: D
• Archive: No

EFCI Southfield Mine — 2012 Annual Hydrology Report April 18, 2013
joint inspection attendees were five (5) persons representing Corley, DRMS Inspector Janet Binns,
and George Patterson of EFCI. The concerns and resulting inspection were prompted by statements
from the Corley Ranch Manager that water flow in Newlin Creek had disappeared into the creek
bed alluvium during the second quarter of 2011 at a point several hundred feet downstream from the
Thompson Ranch access road culvert. As stated in the DRMS Inspection Report dated March 27,
2012, "this location was marked with pink flagging tape and GPS coordinates. Dr. Corley had the
coordinates in his GPS. The Division collected GPS data using an "Xplore Tablet ". After inspection
of the area, there was no surface expression of subsidence cracks or holes observed. There was no
apparent cracking or holes visible at the marked location as is described by the inspector's report.
EFCI's approved permit document describes in detail, in the hydrology baseline section and the
Probable Hydrologic Consequences (PHC) section, potential mining impacts to Newlin Creek
(Permit Section 2.05.63 and pages 2.05.6 — 55). Predictions in the approved permit address the
potential that surface water may enter underground voids through surface fractures or subsidence
activity. The alluvium of the Newlin Creek bed is very deep and wide consisting of sand, gravel
and boulders. The same trend as described above, diminishing water flow in Newlin Creek has
been occurring for numerous years, especially in the latter years having drought conditions.
The City of Florence diverts much of the water from upstream of the mine area for city water use.
On several occasions during years of limited precipitation and low snow melt runoff, Newlin Creek
water flow at the surface has not reached EFCI's lower water sampling point (NC1) located in the
creek bed adjacent to the eastern boundary of the permit area. Data concerning surface water
monitoring and sampling is recorded in the Annual Hydrology Reports (AHR's) which are on file
with the DRMS.
In response to the landowner's (Corley) concerns, EFCI performed extra monitoring of Newlin
Creek during the period of April 2, 2012 through April 24, 2012 in addition to observation during
the previous month. Excerpts from EFCI's field notes are as follows:
—* 4/02/2012: Less than 1 inch of water flowing through the 48 inch diameter culvert at the
Thompson Ranch access road.
—► 4/03/2012: Received 5 inches of snow but only 1.5 inches of water flowing in Thompson
culvert.
— ► 4/04/2012: 2.5 inch deep water in Thompson culvert. Water flow has not reached the lower
Sample Point (NCI).
—* 4/05/2012: 2.5 inch deep water in Thompson road culvert. The previously reported location of
water disappearing (pink flagging tape) was checked. Water continued to flow 400 feet beyond the
marked location with no visible reduction in the rate of flow.
— ► 4/05/2012: Upstream, at the Florence Mountain Park culvert, water measured 2 inches deep
with width of 30 inches in the flat - bottomed culvert.
— 4/09/2012: 2.5 inch deep water in the Thompson culvert. No water at the lower sample point
(NC 1). Nor had any water reached a point approximately 1600 feet upstream from NC1.
—* 4/11/2012: Thunder shower at the mine area.
—* 4/12/2012: 4.5 inch deep water in Thompson culvert. Water flow had reached a point
approximately 1200 feet upstream from the lower sample point, NC 1. At that point, the water had
slowed and pooled along the streambed for a distance of about 500 — 600 feet where it was
percolating into the sand, gravel and boulder alluvium. Water flow did not reach NC1.
—* 4/16/2012: 2.5 inch deep water in Thompson culvert.
2012 AHR text doc
Page 19