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 29 of 167. I 'IS I a -t,. ~ , J I I I I I I I, i. !:l 8 , Ill14/l-MRS Nov 26, 1983 1>11 2.2.4 Groundwater Demand For the four cases considered {median, 1 in 5 year dry, J in 10 year d~ and 1 in 50 year dry), the balance of water U';C and water available has been examined and the results are presented in Figures 7-10. The groUJ."'1dwatez- demand for each case hn.s been summarised in Table 8. The inflow uf groundWr'lter to the pit has been Ci!;;Slli'11ed to be negligible. TABLE 8 ANNUAL GROUNDWATER DEPJu~D PROCESS WATER GROUNDl1ATER DEH!'~~D (Hi/year) Median 147 1 in 5 year dry la' 00 1 in 10 year dry 343 1 in 50 year dry 479 J 5 The figures in Table 8 can be regard~d a' a reasonable estim~tc oft he annual groundwater makeup- requirernen t. T!'-le resul ts sho ...... that fo~ the median year the make up requirement is nil, but !.his increases g~adually for the 1 in 5 r 1 in 10 and 1 in 50 year drys. The 1 in 5 year d~YI which has been adopted as a basis for d<:c-:iqn indicates an annual water rieficit of 196 ml. It is pointed out that this figure does not represent the peak demand on groundwater, but rather the average demand over 12 months. Depending on the water management strategy adopted, and the process reservoir storage, the groundwater make-up requirement is estimated at ID l/sec. This assumes a pump duty cycle of 20 hours per day, 270 days per annum. Peak monthly demands 'I,,.auld be met by depl etian of process rr:.servoir storage. Assuming the ptu~ess water reservoir holds adequate water in storage prior to start up, a make up capacity of 10 l/sec will provide adequate safeguard against a 1 in 5 lear dry during the life of the project. This will require that the process reservoir is constructed at least one wet season prior to start up. Preliminary estimates show that, on the basis of a 1 in 5 yea-.= dry, attention will need to be paid to ensuring water catchment areas a~e maximized, and the boreficld is commissioned at the