Territory Stories

Mud tank - mining water supply, bore completion report RN 16676 and 1667

Details:

Title

Mud tank - mining water supply, bore completion report RN 16676 and 1667

Creator

Rooke, E.; Northern Territory. Power and Water Authority. Water Resources Branch

Collection

E-Publications; E-Books; PublicationNT; Report No: 36/1995

Date

1995-08-01

Notes

Made available via the Publications (Legal Deposit) Act 2004 (NT)

Language

English

Subject

Borings -- Northern Territory -- Mud Tank Gemfield; Water-supply -- Northern Territory -- Mud Tank Gemfield; Borings -- Northern Territory -- Plenty Highway; Water-supply -- Northern Territory -- Plenty Highway

Publisher name

Northern Territory Government

Place of publication

Alice Springs

Series

Report No: 36/1995

Format

1 volume (various pages) : maps ; 30 cm.

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/10070/228067

Citation address

https://hdl.handle.net/10070/674628

Page content

Technical Report WRD95036 Viewed at 20:02:23 on 17/02/2010 Page 11 of 28. I I I I I I I I I I I I I I I I I I I ~ strike from a quartz dyke which terminated abruptly against the opposite ba.."lk. After penetrating highly to extremely weathered gneiss the rock became harder with depth and drilling was abandoned at 40 m after hitting fresh gaL~let-rich gneiss at 36 m. This dry hole was backfilled. A three by 100 minutes step-test (at 0.2; 0.4 and 0.6 Lis) ''''as carried out on RN 16675 on 16th June 1995. SWL prior to co~~encing pumping was 45.3 m bgl. After allowing 18 hours recovery, a second step- test was done commencing at a rate of 0.6 LIs; increased to 0.8 Lis for the last 100 minutes. The pump used was a "640 Mono" powered by a 3 cylinder Lister diesel engine. It was installed at 54 rn bgl, that is at the top of the perforated casing. At 0.6 Lis a maximum drawdown of 5.3 m occurred which, ostensibly, had levelled out. At 0.8 Lis there was 8.2 m of drawdown which continued to accelerate until the bore was on the verge of forking. Pn analysis of the tests is given as Appendix B. Care should be taken in any interpretation of this graph as steady-state conditions were not attained. Based on short duration test pumping, the recommended pumping rate for RN 16676 should not exceed 0.5 Lis continuous discharge. The pump should be set at 54 m bgl; this provides 8 m available drawdown at present water table conditions. It is understood that the client is installing a header tank; this should allow for 24 hours' storage in case of pump failure or maintenance. Ideally, an air-line (in the bore) and a meter (delivery main) should be installed to measure pumping water levels and abstraction, respectively. EC readings remained consistent for the duration of test :;H.l-,uping (range of l360 I.lS/c.'Il to 1480 I.lS/cm), indicating chemically good quali ty water, sui table for drinking. Turbidity was high for the first hour of pumping with a yellow discolouration; thereafter becoming clean with no suspended solids. Bacteriological testing was not done. The client was satisfied with the level of testing on fu~ 16676. He did not require bore RN 16677 to be tested ("hich will not be


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