Thank you for the source. Keith -----Original Message----- From: HISTORICAL ARCHAEOLOGY <[log in to unmask]> On Behalf Of Karen Swope Sent: Friday, August 6, 2021 10:52 AM To: [log in to unmask] Subject: Re: Drill holes Keith, This document: https://www.blm.gov/sites/blm.gov/files/documents/files/Library_California_CulturalResource_MiningSouthernDeserts_.pdf, "Mining in the Southern California Deserts: A Historic Context Statement and Research Design," contains lots of information about changes in drilling technology over time. Just search "drill" in the document. More details about the mechanics of drilling, drilling equipment, and the potential archaeological signature of the various technologies appears in Eric Twitty's "Blown to Bits in the Mine: A History of Mining & Explosives in the United States." Karen Karen K. Swope, Ph.D. Principal Investigator, Historical Archaeology Statistical Research, Inc. 117 Bryn Mawr Drive SE, Albuquerque, NM 87106 (505)323-8300 [log in to unmask] Statistical Research, Inc., is a certified woman-owned small business that has provided Cultural Resource Management and Historic Preservation services since 1983. This communication is confidential and is intended only for the use of the individual or entity named above. If you have received this communication in error, please immediately destroy it and notify the sender by reply e-mail or by telephone (909)335-1896 (call collect). -----Original Message----- From: HISTORICAL ARCHAEOLOGY [mailto:[log in to unmask]] On Behalf Of Keith Doms Sent: Thursday, August 5, 2021 8:09 PM To: [log in to unmask] Subject: Drill holes Does anybody know of any studies that allow you to identify different types of drill or blasting holes? Hand, early steam drill, carbide? Keith Doms Newlin Grist Mill ######################################################################## Access the HISTARCH Home Page and Archives: https://url.emailprotection.link/?bhD6fta3aJy-56wqrWz3WX6qm67fw1GhMVPCxYBuayqJOZ6Rs0iHzQwVnl9IkexGmA-RvKbZivnbBfMvCRvakbzjmSbWY7joFrGY9TGHdvI-WHbC3dxJz2LRqpf_3qYNH Unsubscribe from the HISTARCH List: https://url.emailprotection.link/?bhD6fta3aJy-56wqrWz3WX6qm67fw1GhMVPCxYBuayqJOZ6Rs0iHzQwVnl9IkexGmcPU6r2bOfLdV1xb3q--IUDYNj7C9W3L8L_7O3bIzMCRKv36NlduXv43lVX876Q7x_ZwKcsUv6IhMXzMaa2vZyHUz6z4fvTIW3pZ2GW7ZtZU~ This email list is powered by LISTSERV: https://url.emailprotection.link/?byKWgYzX0cwcFgTyTgl1cin1qTjgdGXV-cOfvPcyU82ISnEQ3y2aJc1d_2FTUNcugdXX5acuSyt5HtYuN0S6x3BixaZbvyekS0acycf7eEblrk8CCYS2ceXF_irAibRNG ######################################################################## ######################################################################## Access the HISTARCH Home Page and Archives: https://community.lsoft.com/scripts/wa-LSOFTDONATIONS.exe?A0=HISTARCH Unsubscribe from the HISTARCH List: https://community.lsoft.com/scripts/wa-LSOFTDONATIONS.exe?SUBED1=HISTARCH&A=1 This email list is powered by LISTSERV: https://www.lsoft.com/LISTSERV-powered.html ######################################################################## ######################################################################## Access the HISTARCH Home Page and Archives: https://community.lsoft.com/scripts/wa-LSOFTDONATIONS.exe?A0=HISTARCH Unsubscribe from the HISTARCH List: https://community.lsoft.com/scripts/wa-LSOFTDONATIONS.exe?SUBED1=HISTARCH&A=1 This email list is powered by LISTSERV: https://www.lsoft.com/LISTSERV-powered.html ########################################################################