Stress Measurements

Agapito Associates, Inc., (AAI) has the equipment and personnel for overcoring, sample coring, and instrumentation installation in limited access, surface, and underground mine locations.

In-Situ Stress Determinations, Instrumentation, and Limited Access Core Drilling

Our drill rigs (Boyle Super 300, SD-1500, CP-65, and Ingetrol Explorer Jr 75E) are ideal for overcoring USBM Borehole Deformation or CSIRO Hollow Cell Inclusion gages, and our Strain Indicators and our Boyle Super 300 and CP-65 drill rigs are portable for difficult access locations and are permissible for use in “gassy” mines.

Our SD-1500 core drilling rig can be set up on tracks or skids and can be powered with a diesel engine, electric motor, or pneumatic-hydraulic powerpack.  Our drill rigs are capable of drilling any angle from vertical down to vertical up.

Additionally, AAI provides services for measuring in-situ horizontal stresses using an innovative down-hole measurement instrument, developed by Sigra, Ltd. of Australia. The Sigra system is the most advanced biaxial overcore stress measurement system in the world.

Click here for more information: Sigra IST In-Situ Stress Measurement Tool

IST in-Situ Stress Measurement Tool
Sigra IST In-Situ Stress Measurement Tool

Security, safety, and environment are taken very seriously by everyone at AAI. Our “featured project list” provides examples of our ability to adhere to the specific policies, procedures, and protocols of our clients.

AAI has successfully measured in situ stress in copper, oil shale, molybdenum, trona, limestone and coal mines, and in tunnels and concrete dams since 1978. Since 1994, our current staff has completed 580 overcore stress determinations.

USBM BDG Method Overcoring Stress Determinations Since 1994

Year Client No. of Successful Runs
2016 Stillwater 4
2014 Graymont 13
2013 Dominion 74
2013 Subterra, LLC 3
2013 SURF 5
2010 Resolution Copper 4
2009 HDR Engineering, Koewee Dam 6
2008 Oxbow Mining LLC, Elk Creek Mine 5
2008 UtahAmerican Energy Inc., West Ridge Mine 4
2007 Gannett Fleming, Roanoke Rapids Dam 18
2007 Canyon Fuels, SUFCO Mine 2
2007 Chemical Lime Company, Kimballton Mine 11
2005 Climax, Henderson Mine 2
2004 Andalex Resources, Aberdeen Mine 4
2003 Acres International, Robert Moses Niagara Power Project 18
2003 U.S. Bureau of Reclamation, Seminoe Dam 19
2003 FMC, Westvaco Mine 12
2003 OCI Wyoming, LP, Big Island Mine 18
2002 OCI Wyoming, LP, Big Island Mine 6
2002 Dravo Lime Co., Black River Mine 15
2000 Mountain Coal Company, West Elk Mine 8
2000 OCI Wyoming, LP, Big Island
Mine
40
2000 NIOSH, Tanoma Mine 2
2000 CDC, Norton Energy Project 6
1999 CDC, Norton Energy Project 2
1999 Stone & Webster Engineering, Santeetlah Dam (Fall ’99) 15
1999 Solvay Minerals 35
1999 Stone & Webster Engineering, Santeetlah Dam (Winter ’99) 15
1998 Stone & Webster Engineering, Santeetlah Dam (Fall ’98) 67
1998 OCI Wyoming, LP, Big Island Mine 25
1998 Energy West, Deer Creek Mine 5
1998 Bowie Resources, Bowie #2 Mine 8
1998 Stone & Webster Engineering, Santeetlah Dam (Spring ’98) 68
1997 OCI Wyoming, LP, Big Island Mine 14
1997 Stone & Webster Engineering, Santeetlah Dam 20
1997 Energy West, Deer Creek Mine 20
1996 Solvay Minerals 9
1995 Solvay Minerals 72
1994 Sandia National Laboratories, DNA 9
Overcoring up from 4.5-ft wide by 7-ft high gallery in a concrete dam with a Longyear CP-65 pneumatically driven core drill.
Overcoring up from 4.5-ft wide by 7-ft high gallery in a concrete dam with a Longyear CP-65 pneumatically driven core drill.
CSIRO Hollow Cell Inclusion Gage
CSIRO Hollow Cell Inclusion Gage
A CP-65 pneumatically powered core drill is mounted to the upstream face of a concrete dam for overcoring. A barge is tied off to the face of the dam for safe operation of the drill and overcoring activities.
A CP-65 pneumatically powered core drill is mounted to the upstream face of a concrete dam for overcoring. A barge is tied off to the face of the dam for safe operation of the drill and overcoring activities.
Overcoring Horizontally in an Underground Trona Mine
Overcoring Horizontally in an Underground Trona Mine
Have questions? Contact our technical staff for answers.
Project Summaries & Publications: Stress Measurements