Mult seam working..

[colly0410]

When I worked at Hucknall pit they worked the Deep Soft seam & Black Shale seam about 300 feet deeper. When K6's in the Black Shale went under the Deep Soft main intake I'd never seen weight/crush like it: they had wooden pit props like tree trunks just snapped like match sticks, the 3,300 volts cables would rub on the belt & had to be reposition'd on an almost daily basis, was a right job to keep the roadway open. Wondering what other pits experience's were with multi seam working one above the other?

[rob52]

Plenty of Multi-seam working in NSW Central Coast & Hunter Valley Area

#########

Wallarah Colliery

www.minesurveyors.com.au/files/members/2002SeminarPapers/aimswallarahhistory.pdf
Wallarah Colliery did Bord & Pillar in:
Wallarah Seam
Great Northern Seam plus BLS & FCT Production Panels
Proposed LW in the Fassifern n 1998 but shut instead

Chainvalley
majorprojects.planningportal.nsw.gov.au/prweb/PRRestService/mp/01/getContent?AttachRef=SSD-5465%2120210302T015536.770%20GMT
Chainvalley did Bord & Pillar in:
Wallarah Seam &
Great Northern Seam
Pg30
then MiniWall in the Fassifern

Cumnock No.1
Cumnock No.1 put Longwall thru three seams (was Liddell State Mine)
Pikes Gulley, Liddell & Barrett…then….
“shut down the underground longwall operations as a result of adverse geological conditions” it was not pretty!

Geology in that area is complicated by Bayswater Syncline & faulting
Bayswater Seam
Lemington Seam
Pikes Gully 2.2m at 200m cover
Upper Liddell Seam 2.2m
Upper Lower Liddell Seam 2.1m
Lower Barrett Seam 2.2m at 300m cover

Ravensworth U/G
www.google.com/url?sa=i&rct=j&q=&esrc=s&source=web&cd=&ved=0CAIQw7AJahcKEwjQvarRx5f_AhUAAAAAHQAAAAAQAg&url=https%3A%2F%2Fepbcpublicportal.awe.gov.au%2F_entity%2Fsharepointdocumentlocation%2F33cbc4e7-94d1-ec11-a7b6-002248187599%2F2ab10dab-d681-4911-b881-cc99413f07b6%3Ffile%3DAtt_H-RUM_Mod9_Environmental_Assessment.pdf&psig=AOvVaw1mxL2Ycn5nxeO_nTHk4yf3&ust=1685347546140323
Longwall Panel extraction within the Lemington, Pikes Gully, Liddell (Upper and Middle) and Barrett Seams

Wambo
majorprojects.planningportal.nsw.gov.au/prweb/PRRestService/mp/01/getContent?AttachRef=DA305-7-2003-I-MOD-13%2120191216T020107.771%20GMT
Pg4
Homestead & Wollemi Mine Operations in Whybrow Seam
NWUM Workings in Wambo Seam
United Workings in Woodlands Hill Seam
Approved LW in Arrowfield & Bowfield Seam

“to achieve the subsidence impact performance measure, all longwalls at the Wambo Coal Mine are offset from the base of the escarpment”
majorprojects.planningportal.nsw.gov.au/prweb/PRRestService/mp/01/getContent?AttachRef=DA305-7-2003-I-MOD-12%2120191216T020048.735%20GMT
Then continues to
Woodlands Hill
Arowfield Sem
etc

majorprojects.planningportal.nsw.gov.au/prweb/PRRestService/mp/01/getContent?AttachRef=DA305-7-2003-I-MOD-13%2120191216T020107.771%20GMT
Pg6
revised calibrated Incremental Profile Model indicates that multi-seam interactions and reactivation of goaf in the overlying Whybrow Seam workings would increase maximum predicted vertical subsidence by 1.0 - 1.6 m, but would not affect maximum tilts and strains. The modification area is therefore predicted to experience maximum vertical subsidence (from previous mining in the Whybrow Seam, current mining in the Wambo Seam, and approved mining in the Arrowfield and Bowfield Seams) of 9,900 mm, similar to that now predicted for Longwalls 1 - 8.

Ashton had a crack to:
www.ashtoncoal.com.au/icms_docs/254850_volume-2-appendix-04_subsidence_sct.pdf
Pg4
PIKES GULLY 1.6m
UPPER LIDDELL 3.7m
UPPER LOWER LIDDELL 5.8m
LOWER BARRETT 8.3m

Maxwell (effectively Drayton South as a U/G)
malabarresources.com.au/images/maxwell/environmental-monitoring-audit-information/2014/Appendix_B__Subsidence_Assessment_Part_A.pdf
Pg21 (Pg30 of .pdf)
they will find out.

Also coming soon:
Spur Hill
majorprojects.planningportal.nsw.gov.au/prweb/PRRestService/mp/01/getContent?AttachRef=PDA-105%2120190228T215914.010%20GMT
Will find out.
Spur Hill, proposes LW thru:
Whynot Seam;
Bowfield Seam; &

Warkworth Seam.

Rob

[colly0410]

Interesting reading Rob 52, thanks for posting...