2015-11-23_REVISION - C1982056

• Permit No: C1982056
• IBM Index Class Name: Revision
• Doc Date: 11/23/2015
• Doc Name: Response
• From: DRMS
• To: Mark Tobias
• Type & Sequence: PR10
• Email Name: JLE
• Email Name: DIH
• Media Type: D
• Archive: No

11/23/2015 State.co.us Executive Branch Mail-Re:Subsidence Effects to Archaeological Sites in the Twentymile Mine
(besides a decrease in elevation) are the effects of subsidence on sites, if any. Your e-mail is timely
because if the necessity of a case study is to be decided by the current LSFO management, it needs to
happen sooner rather than later. I have discussed the proposed case study with Assistant Field Manager
Tim Wilson, but he is leaving LSFO at the end of the week to accept a position in Wyoming. I have yet to
discuss the matter with Field Manager Wendy Reynolds, but plan to do so in the near future. She will be
retiring at the end of December.
Your e-mail implies that the MAC report for the Sage Creek Mine may have useful information to help SHPO
consider the effects of subsidence of sites at the Foidel Creek Mine. The report does have a discussion of
subsidence resulting from longwall mining and from information in the report, one might suggest that
concerns about subsidence are less in the center of the mined area where subsidence is uniform in
comparison to areas around the periphery of the mined area where the "angle of draw" will affect the degree
of slope. If you think the report would help you to consider the effects of subsidence on sites at the Foidel
Creek Mine, I could ask MAC to e-mail you an electronic version of the final report. I do not have an
electronic version. Let me know.
will call you about this next week, but since you included me and the Sage Creek Mine consultation in
your e-mail discussion with DRMS about the Foidel Creek Mine, I felt obliged to respond in writing.
Bye for now.
On Wed, Nov 18, 2015 at 1:01 PM, Tobias - HC, Mark <[e-mail]> wrote:
Jared:
Thanks for forwarding Metcalf s analysis of potential effects associated with Twentymile's Wolf Creek
Seam project. Unfortunately, our office has not yet received a copy of the report titled"Peabody Sage Creek
LLC:A Class III Cultural Resource Inventory of the Sage Creek Subsidence Expansion Area, Routt County,
Colorado(2013, revised April 2015)from BLM Little Snake. And as this report appears somewhat central
to Metcalf s letter and as it may inform this consultation, I've copied Brian Naze,the Little Snake FO
archaeologist, in my response. I will also say that while Brian and I have informally discussed the
possibility of baseline subsidence studies as terms of mitigation for the Sage Creek Expansion which
Metcalf recommends as worthwhile, no formal consultation has yet occurred. Brian, what is the status of
the Sage Creek consultation?
Mark
Mark Tobias
Section 1o6 Compliance Manager
Office of Archaeology and Historic Preservation
History Colorado
>2oo Broadway
Denver, Colorado 80203
[phone]
[e-mail]
On Thu, Nov 5, 2015 at 9:00 AM, Ebert - DNR, Jared <[e-mail]> wrote:
Mark,
On September 11, 2015 the Division received a letter from your office regarding the results of a cultural
resources inventory that was conducted for three revisions proposed for the Foidel Creek Mine's mining
permit (C-1982-056). The revisions included MR289, PR10 and PR11. Regarding MR289, it was found
that the project would result in no historic properties affected. For PR10 and PR11, your office
requested additional information regarding the nature and extent of potential subsidence effects on two
sites (5RT3324 and 5RT3325). The Division requested the permittee (Twentymile Coal, LLC.)to
conduct an analysis of subsidence impacts to these sites. They hired Metcalf Archaeological
hftps://mail.google.com/mail/u/0/?ui=2&ik=e29129fcb5&vi ew=pt&search=i nbox&th=15134d8d97b8e5c9&si m 1=15134d8d97b8e5c9 2/4