The mine facility most susceptible to earthquake damage is the tailings impoundment. Of course the mine buildings should also be resistant to failure in the event of a big one. Here are some links to sources of data on earthquakes and consultants who may be able to help you. If you are not listed here and provide similar services, please let me know and I will add in your information.

A good list of links to earthquake data in the United States is to be found at this link. This is part of the Earth Consultants, Inc. website. They are a consulting company in Orange County, California. They describe the scope of their services relative to earthquakes as including:

3D Modeling & Visualization of Strong Ground Motion
Code-Based Site Analyses
Design Response Spectra
Deterministic Analyses
Fault Activity Investigations
Fault Mechanism & Orientation Studies
Liquefaction Studies
Loss Estimation Using HAZUSTM
Peak Ground Acceleration & Velocity
Probabilistic Analyses
Seismically-Induced Landslides & Settlement
Time Histories of Strong Ground Motion

I note they investigated the faults at the Belmont Learning Center in downtown Los Angeles. This is a new school that was partially built when issues of gas emanating from underground oil reservoirs and faults crossing the site brought work to a stop. The story is long and involved, but ultimately traceable back to inadequate site characterization and hasty decision making. As a result of the work by Earth Consultants, some of the partially completed buildings over faults were demolished. A sober lesson for all.

There are a few consultants in the category Seismic in the InfoMine consultants database. 

I suspect many consultants who design tailings impoundments can address earthquake issues at your mine, even though they do not spell this out specifically on their websites. Obvious examples include HCItasca, Golder Associates, SRK, AMEC, etc. You will just have to ask your favorite consultant about their capabilities.

The best I know of is Tarik Hadj-Hammou now with SES in Irvine, California. He, along with Edward Kavazanjian could, I believe, solve any earthquake-related problem at a mine.

In Canada, there is Peter Byrne of the University of British Columbia in Vancouver. He has written more and advanced the state of earthquake engineering at mines more than any other I know.