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Transline Infrastructure Corridor Vegetation and Flora Survey

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Transline Infrastructure Corridor Vegetation and Flora Survey TROPICANA GOLD PROJECT Tropicana – Transline Infrastructure Corridor Vegetation and Flora Survey 025 Wellington Street WEST PERTH WA 6005 phone: 9322 1944 fax: 9322 1599 ACN 088 821 425 ABN 63 088 821 425 www.ecologia.com.au Tropicana Gold Project Tropicana Joint Venture Tropicana-Transline Infrastructure Corridor: Vegetation and Flora Survey July 2009 Tropicana Gold Project Tropicana-Transline Infrastructure Corridor Flora and Vegetation Survey © ecologia Environment (2009). Reproduction of this report in whole or in part by electronic, mechanical or chemical means, including photocopying, recording or by any information storage and retrieval system, in any language, is strictly prohibited without the express approval of ecologia Environment and/or AngloGold Ashanti Australia. Restrictions on Use This report has been prepared specifically for AngloGold Ashanti Australia. Neither the report nor its contents may be referred to or quoted in any statement, study, report, application, prospectus, loan, or other agreement document, without the express approval of ecologia Environment and/or AngloGold Ashanti Australia. ecologia Environment 1025 Wellington St West Perth WA 6005 Ph: 08 9322 1944 Fax: 08 9322 1599 Email: [email protected] i Tropicana Gold Project Tropicana-Transline Infrastructure Corridor Flora and Vegetation Survey Executive Summary The Tropicana JV (TJV) is currently undertaking pre-feasibility studies on the viability of establishing the Tropicana Gold Project (TGP), which is centred on the Tropicana and Havana gold prospects. The proposed TGP is located approximately 330 km east north-east of Kalgoorlie, and 15 km west of the Plumridge Lakes Nature Reserve, on the western edge of the Great Victoria Desert (GVD) biogeographic region of Western Australia. The project is a joint venture between AngloGold Ashanti Australia Limited (70% and Manager) and the Independence Group NL. As part of the proposed TGP the TJV intends to construct an infrastructure corridor between Kalgoorlie and the project area. The infrastructure corridor will contain an access road and / or fibre optical cable for site communications. The TJV is current evaluating two different routes, one via Pinjin Station and one via the existing Trans Australian Railway Line Access Road. This report presents the findings of the flora and vegetation assessment for the Tropicana-Transline option. The proposed infrastructure corridor travels south of the proposed TGP, west of the boundary of Plumridge Lakes Nature Reserve (immediately east of Tropicana) and south to the Trans Australian Railway Line Access Road; it is to be called the Tropicana-Transline Infrastructure Corridor (Corridor). The Corridor will be located within Miscellaneous License L39/186, granted under the WA Mining Act. AngloGold Ashanti Australia on behalf of the TJV contracted ecologia Environment to conduct a level one flora and vegetation survey along the route of the proposed Corridor. The results are to be used during the environmental impact assessment process for the project. The objectives of the survey were to: • Survey the flora and vegetation along the proposed Corridor to determine whether any species or ecological communities of conservation significance occur along the route, and if present, indicate management options to prevent or minimise the impacts due to disturbance; and • Map the main vegetation units occurring along the length of the proposed track. A baseline survey of the vegetation and vascular flora of the Corridor was undertaken between the 13th and 22nd of July, 2007; one section of the Corridor could not be surveyed during this time and it was assessed between the 20th and 24th of August 2007. One hundred and fourteen quadrats and 59 transects were surveyed along the Corridor. Four hundred and seventeen flora taxa were recorded along the Corridor including subspecies, varieties, forms and affinities. The taxa comprised 52 families, 142 genera and 372 confirmed species. The most species rich plant families were: Myrtaceae (43 confirmed species), Mimosaceae (34 confirmed species), Poaceae (29 confirmed species), Chenopodeaceae (26 confirmed species) and Myoporaceae (25 confirmed species). The most species rich genera were Acacia (34 confirmed species), Eucalyptus (29 confirmed species) and Eremophila (24 confirmed species): 19 families and 83 genera were represented by a single taxon. Only one of the 417 taxa recorded was a weed species. Nine main vegetation units were mapped along the Corridor and these were further divided into 21 vegetation sub-units. The main vegetation types recorded were: Mixed Eucalyptus woodland over hummock grassland, Callitris preissii tall shrubland, Mixed Eucalyptus woodland over Triodia scariosa hummock grassland, Mixed Eucalyptus woodland with Acacia understorey, over Triodia desertorum hummock grassland, Triodia rigidissima hummock grasslands, Acacia aneura woodland, Heath, Triodia basedowii hummock grassland and Casuarina shrubland over low heath. No federally or state protected Declared Rare Flora taxa or threatened ecological communities were recorded during the survey. One priority ecological community occurs in the area – “Yellow sandplain communities of the Great Victoria Desert”. Fourteen Priority ii Tropicana Gold Project Tropicana-Transline Infrastructure Corridor Flora and Vegetation Survey flora taxa and two of potential conservation significance were recorded, along with six taxa with marked range extensions. Conformance of the project to relevant EPA statements is addressed in the body of this report along with the conservation significance of the vegetation and flora of the Corridor and an assessment of potential impacts. Significant threats to biodiversity, ecological function, vegetation and flora of conservation significance identified by a risk analysis include vegetation clearing, fire, dust and off-road driving. Possible management options are included in a risk analysis for consideration. iii Tropicana Gold Project Tropicana-Transline Infrastructure Corridor Flora and Vegetation Survey Table of Contents 1.0 INTRODUCTION .........................................................................................................................1 1.1 PROJECT OVERVIEW..................................................................................................................1 1.2 PREVIOUS BIOLOGICAL SURVEYS................................................................................................4 1.3 SURVEY OBJECTIVES .................................................................................................................5 2.0 BIOPHYSICAL ENVIRONMENT ................................................................................................7 2.1 CLIMATE....................................................................................................................................7 2.2 GEOLOGY................................................................................................................................10 2.3 SOILS......................................................................................................................................11 2.4 BIOGEOGRAPHIC REGIONS AND LANDFORMS .............................................................................11 2.5 VEGETATION COMMUNITIES......................................................................................................14 2.6 LAND USE HISTORY .................................................................................................................15 3.0 SURVEY METHODS.................................................................................................................17 3.1 SURVEY TIMING .......................................................................................................................17 3.2 SITE SELECTION ......................................................................................................................17 3.3 SAMPLING METHODS ...............................................................................................................17 3.4 FLORISTIC SURVEY SITES ........................................................................................................17 3.5 SURVEY LIMITATIONS AND CONSTRAINTS ..................................................................................20 3.6 DATA ANALYSIS .......................................................................................................................21 3.7 SURVEY TEAM .........................................................................................................................22 4.0 RESULTS..................................................................................................................................23 4.1 FLORA.....................................................................................................................................23 4.2 FLORA OF CONSERVATION SIGNIFICANCE ..................................................................................23 4.2.1 Results of Database Searches..........................................................................................23 4.2.2 Conservation significant flora recorded during the Corridor survey ..................................25 4.2.3 Flora of potential conservation significance recorded during the Corridor survey ............31 4.3 INTRODUCED FLORA ................................................................................................................33
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