Abstract
to a depth of 230 feet (Abernathy and Jewett, 1946). The miners then started a shaft 7x7 feet wide, and the excavated material was brought to the surface in large buckets pulled up by mules. After mining about 50 feet of limestone, a thick shale was encountered which was easier to excavate (Fig. 2). To save time and money a large room was excavated at about 150 feet where the miners could sleep and eat. That way they could continue their work without interruption (G.W. Hosack, pers. comm. 2011).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
