Territory Stories

Renison Goldfields Consolidated Limited, Pine Creek Project. Groundwater Investigation Stage 2, Establishment of Borefield and Management Studies. Report H114/3-AA.

Details:

Title

Renison Goldfields Consolidated Limited, Pine Creek Project. Groundwater Investigation Stage 2, Establishment of Borefield and Management Studies. Report H114/3-AA.

Creator

Coffey & Partners Pty Ltd

Collection

E-Publications; E-Books; PublicationNT; Report no. 87/1984

Date

1983-11-01

Notes

Date:1983-11

Language

English

Publisher name

Northern Territory Government

Place of publication

Darwin

Series

Report no. 87/1984

File type

application/pdf

Use

Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government

License

https://creativecommons.org/licenses/by/4.0/

Parent handle

https://hdl.handle.net/10070/228435

Citation address

https://hdl.handle.net/10070/674167

Page content

Technical Report WRD84087 Viewed at 14:07:14 on 29/07/2010 Page 75 of 167. , J I , t I I I I I I I I I I I I I I I I I I I .,,-w H1l4/1-MRS Nov 26, 1983. --_.-- ---_ .... The component of flow in the directinn of the main hydraulic gradient can be "stimated by using Darcy' S c'l{uution and adj'..J.sting permeabilities to re.flect aq,ui' ~r <.1nisotrophy. i\ssumjnq permeability ratios cf 100: 1 and 10:1, grolli'lf"lw.ater flow towards the borefield from the mine area is calculated to range between 10 and 100 m'/d per 1000 metres flow width. This assu"'"n(-'S transrr.issi",,lities of 0.4 and 4.0 m2/d/:n across strike. While such flows are low, they are thought to be of the right order 0 f m~1gni tude, and consiste:lt wi th the Ions term pumpinr'f ;Ates maintained from both the town borcEield and the Ent,.'_lpri,;c Shaft. 45. With the data available, quantitative esti.mates of groundwater [low induced al'.nlg strike are precluded. iowever/ the performance of borp.s such as H.l~2D703 which dra'i,oiS ,...rater from the EPZ attests to the fact ~hat preferred flow c~n and does 1.., cur. 7.5 t4ine Dewatering RcquircFI>?nts Prom an examination of the existing data, aHd in particuiar previous pumping history from the Enterprise Shaft it is ( 't}d.t" that mine dewaterinq requirement will be fairly minimal. A~art from some localized fracturing! aquifer permeability and storativity are relatively low~ Typical aquifer c0cfficicnts und.er sustained pUInping are likely to fl11 in the following ranges : Transmissivity 1-40 m3 /d/m sr"cific yield 0.0001 - 0.01 ?n'sh rock permeability developed below the base of weathering is also known to be extremely low both from drill~Ol.g in the mine area and pumping from the existi!lg Enterprise sha.ft. Higher transmissivity and storage coefficients do apply i~ association with shear zones a~d faulting! although these features tend to be fairly discrete as indicated by strong aquifer boundary conditions wlder sustained pumping . ,. .... t scsag:;;aq;l" ~p.~ ,lL' _c v:cc: ."e