ABN: 35 000 689 216 ABN: 35 000 689 216 Tomingley Gold Project Surface Water Assessment September 2011 Prepared by SEEC Specialist Consultant Studies Compendium Volume 1, Part 2 This page has intentionally been left blank SPECIALIST CONSULTANT STUDIES 2 - 1 ALKANE RESOURCES LTD Part 2: Surface Water Assessment Tomingley Gold Project Report No. 616/06 Tomingley Gold Project Surface Water Assessment Prepared for: R.W. Corkery & Co. Pty Limited 62 Hill Street ORANGE NSW 2800 Tel: 02 6362 5411 Fax: 02 6361 3612 Email: [email protected] On behalf of: Alkane Resources Ltd 65 Burswood Road BURSWOOD WA 6100 Tel: (08) 93289411 Fax: (08) 9227 8178 Email: [email protected] Prepared by: SEEC PO Box 1098 BOWRAL NSW 2576 Tel: 02 4862 1633 Fax: 02 4862 3088 Email: [email protected] September, 2011 SEEC ALKANE RESOURCES LTD 2 - 2 SPECIALIST CONSULTANT STUDIES Tomingley Gold Project Part 2: Surface Water Assessment Report No. 616/06 COPYRIGHT © SEEC, 2011 and © Alkane Resources Ltd, 2011 All intellectual property and copyright reserved. Apart from any fair dealing for the purpose of private study, research, criticism or review, as permitted under the Copyright Act, 1968, no part of this report may be reproduced, transmitted, stored in a retrieval system or adapted in any form or by any means (electronic, mechanical, photocopying, recording or otherwise) without written permission. Enquiries should be addressed to SEEC. SEEC SPECIALIST CONSULTANT STUDIES 2 - 3 ALKANE RESOURCES LTD Part 2: Surface Water Assessment Tomingley Gold Project Report No. 616/06 CONTENTS Page EXECUTIVE SUMMARY ......................................................................................................................................... 2-7 1 INTRODUCTION ............................................................................................................................................. 2-9 2 PROJECT OVERVIEW .................................................................................................................................... 2-9 2.1 Tomingley Gold Project Site .............................................................................................................. 2-9 2.2 Overview of the Project .................................................................................................................... 2-14 3 STUDY AREA ............................................................................................................................................... 2-15 4 ENVIRONMENTAL SETTING ....................................................................................................................... 2-15 4.1 TOPOGRAPHY ............................................................................................................................... 2-15 4.2 LAND USE ....................................................................................................................................... 2-18 4.2.1 Mine Site ......................................................................................................................... 2-18 4.2.2 Surrounding Lands ..........................................................................................................2-18 4.3 SOILS .............................................................................................................................................. 2-18 4.4 DRAINAGE ...................................................................................................................................... 2-19 4.4.1 Regional Drainage ..........................................................................................................2-19 4.4.2 Local Water Courses and Dams .....................................................................................2-19 4.4.3 Catchment Areas and Boundaries ..................................................................................2-21 4.4.3.1 Gundong Creek – Catchment 1 ...................................................................2-21 4.4.3.2 Drainage Lines A, B, C – Catchment 2........................................................2-21 4.4.3.3 Drainage Line D – Catchment 3 .................................................................. 2-21 4.4.3.4 Catchment 4 ................................................................................................ 2-22 4.5 FLOODING ...................................................................................................................................... 2-22 4.6 GROUNDWATER ............................................................................................................................ 2-22 4.7 VEGETATION .................................................................................................................................. 2-23 4.8 CLIMATE ......................................................................................................................................... 2-23 4.8.1 Rainfall ............................................................................................................................ 2-23 4.8.2 Evaporation ..................................................................................................................... 2-24 4.8.3 Rainfall to Evaporation Comparison ................................................................................2-25 5 SURFACE WATER ASSESSMENT .............................................................................................................. 2-26 5.1 PEAK FLOWS ................................................................................................................................. 2-26 5.1.1 Background and Modelling Procedure ............................................................................2-26 5.1.2 Peak Flow Run-off Results ............................................................................................. 2-28 5.2 FLOOD MODELLING ...................................................................................................................... 2-29 5.2.1 Introduction ..................................................................................................................... 2-29 5.2.2 Catchment 1 Flood Heights ............................................................................................2-30 5.2.3 Catchment 2 Flood Heights ............................................................................................2-33 5.3 SURFACE WATER QUALITY AND VOLUMES .............................................................................. 2-33 5.3.1 Background and Introduction ..........................................................................................2-33 5.3.2 Modelling Area ................................................................................................................ 2-33 5.3.3 Climate Data for MUSIC Modelling .................................................................................2-34 5.3.4 Pre-Development Modelling Calibration and Setup ........................................................ 2-34 5.3.5 Operational-Stage Modelling Calibration and Setup ....................................................... 2-35 5.3.6 Results of MUSIC Modelling ...........................................................................................2-37 5.4 HARVESTABLE RIGHT ...................................................................................................................2-37 5.5 WATER SAMPLING AND TESTING ...............................................................................................2-38 5.6 WATER BALANCE .......................................................................................................................... 2-39 5.6.1 Water Demand ................................................................................................................ 2-39 SEEC ALKANE RESOURCES LTD 2 - 4 SPECIALIST CONSULTANT STUDIES Tomingley Gold Project Part 2: Surface Water Assessment Report No. 616/06 CONTENTS Page 5.6.1.1 Introduction................................................................................................. 2-39 5.6.1.2 Operational Water Requirements ............................................................... 2-39 5.6.1.3 Dust Suppression and Revegetation Water Requirements ........................ 2-40 5.6.1.4 Potable / Ablution Water Requirements ..................................................... 2-40 5.6.2 Water Supply ................................................................................................................. 2-40 5.6.3 Water Security ............................................................................................................... 2-40 6 IMPACT ASSESSMENT............................................................................................................................... 2-41 6.1 INTRODUCTION ............................................................................................................................ 2-41 6.2 PEAK FLOWS................................................................................................................................. 2-42 6.3 FLOODING AND ACCESS ............................................................................................................. 2-43 6.3.1 Flood Heights ................................................................................................................. 2-43 6.3.2 Proposed Main Site Access Road .................................................................................