Level 1 Short-Range Endemic Fauna Assessment
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Pilgangoora Project: Level 1 Short-Range Endemic Fauna Assessment Prepared for: Pilbara Minerals June 2016 Final Version Pilgangoora SRE Level 1 Assessment Pilbara Minerals Ltd Pilgangoora Project: Level 1 Short-Range Endemic Fauna Assessment Bennelongia Pty Ltd 5 Bishop Street Jolimont WA 6913 P: (08) 9285 8722 F: (08) 9285 8811 E: [email protected] ACN: 124 110 167 Report Number: 271 Report Version Prepared by Reviewed by Submitted to Client Method Date Michael Curran Danilo Harms Draft Email 24 May 2016 Renee Young Stuart Halse Final Renee Young Stuart Halse Email 01 June 2016 K:\Projects\B_SES_03\Survey_Report\BEC_Pilgangoora SRE_Level1_Final_01vi16.docx This document has been prepared to the requirements of the Client and is for the use by the Client, its agents, and Bennelongia Environmental Consultants. Copyright and any other Intellectual Property associated with the document belong to Bennelongia Environmental Consultants and may not be reproduced without written permission of the Client or Bennelongia. No liability or responsibility is accepted in respect of any use by a third party or for purposes other than for which the document was commissioned. Bennelongia has not attempted to verify the accuracy and completeness of information supplied by the Client. © Copyright 2016 Bennelongia Pty Ltd. Pilgangoora SRE Level 1 Assessment Pilbara Minerals Ltd EXECUTIVE SUMMARY Introduction. Pilbara Minerals Ltd is undertaking a feasibility study for the Pilgangoora Lithium-Tantalum Project. The mine will be located in the northern Pilbara region of Western Australia, approximately 82 km south south- east of Port Hedland. Throughput is estimated to be 2 Mtpa of ore for more than 20 years. A Level 1 Short- Range Endemic Fauna Assessment is required to provide information about the occurrence of short-range endemic invertebrate fauna (SREs) across the Project area and assess the potential impact from mining on SRE fauna. Methods. The assessment was carried out in two stages. First, a desktop review was undertaken to collate existing data on SREs occurring in the vicinity of the Project, as well as to identify the known occurrence of any invertebrate species listed under conservation legislation. Published literature, publically available environmental reports and available online databases were searched to identify potential and confirmed SRE species in groups that contain a high proportion of range-restricted species (the SRE Groups). Detailed habitat mapping was also undertaken to identify landforms potentially suitable to SRE fauna. Second, a reconnaissance field survey was carried out between 18 and 21 April 2016 and a total of 10 sites were sampled by foraging, with three sites in proposed impact areas and seven sites in areas expected to remain undisturbed. Species in SRE groups were identified to species level and SRE status was assessed using the SRE criteria of the Western Australian Museum (WAM). Results. The desktop review showed that no listed invertebrate species occur at the Project. No confirmed or potential SRE species have been collected previously from the Project area either but there are records of at least 56 species belonging to eight SRE groups in the search area surrounding the Project. The vast majority of these species are potential SREs in the WAM sub-category “Data deficient” but there were also seven confirmed SREs (12.5%) in the Project vicinity; some of which have been recorded from habitats similar to those found at the Project. The total area mapped as prospective for SRE fauna is 1,327 ha and covers approximately 36.5% of the Project area. The most prospective habitats in the Project area are Minor Drainage Lines and Hills with Gorges and Breakaways. These two habitats comprise 592.6 ha (16.3%) of the Project area. The most common habitat type, Plains (2309.55 ha, 63.5% of Project area), appears to have little suitability for SRE species. The reconnaissance survey collected at least 23 species belonging to eight SRE groups. The most diverse groups were terrestrial snails and pseudoscorpions with five species each, followed by scorpions (four species), slaters (three species), centipedes and millipedes (two species each) and mygalomorph and selenopid spiders (one species each). No listed and no confirmed SRE species were collected. Although almost half (11) of the collected species were regarded as potential SREs, the majority of these (eight species) were collected either outside or both within and outside the proposed impact areas and are not of conservation concern. Three species were collected from the impact areas only but these are in the SRE category “Data deficient”, which is a category applied to species with unknown ranges for which SRE status cannot be assessed. Conclusion. The landscape in the Project area is relatively uniform with limited availability of potential SRE habitats and most species belonging to SRE Groups were widespread with ranges that extend far beyond the survey area. The proportion of potential SRE species collected was not especially high and the three potential SREs (a spider, centipede and slater) currently only known from proposed impact areas classed as potential SREs because they have unknown, rather than restricted, ranges. The three potential species were collected in habitats that are not restricted at a local, sub-regional or regional level. It is therefore highly likely that the three species have substantial occurrences outside the survey area. There is no foreseeable impact on SRE fauna from Project development because: 1. There is a high level of historical mining disturbance at the Project; 2. No listed or confirmed SRE invertebrate species occur in the Project area and the three potential SREs known only from impact areas are likely to occur more widely; 3. There are no SRE habitats that are unique to the Project and all landforms are widespread beyond the survey area, with no barriers or isolated patches of habitat that might restrict dispersal in SRE fauna; 4. The impact area is very small (823.1 ha) and covers a fraction of a much more extensive greenstone belt that extends towards the east. In summary, this Project will not impact on SRE fauna conservation values and listed invertebrate species. There is no threat to this community from Project development. iv Pilgangoora SRE Level 1 Assessment Pilbara Minerals Ltd CONTENTS EXECUTIVE SUMMARY .............................................................................................................................. IV 1. INTRODUCTION .............................................................................................................................. 7 2. FRAMEWORK................................................................................................................................... 7 2.1 Project Description .......................................................................................................................... 7 2.2 Regional Context .......................................................................................................................... 10 2.3 Conservation Framework ............................................................................................................ 11 2.4 SRE Classification .......................................................................................................................... 11 3. DESKTOP REVIEW ........................................................................................................................ 12 3.1 Habitat Assessment ...................................................................................................................... 12 3.2 Previous Fauna Surveys ............................................................................................................... 15 3.3 WAM Database Searches and Results of Previous Surveys ................................................... 15 3.4 SRE Groups Likely to Occur at the Project ................................................................................ 16 3.4.1 Spiders ................................................................................................................................ 16 3.4.2 Harvestmen ......................................................................................................................... 17 3.4.3 Pseudoscorpions ................................................................................................................. 17 3.4.4 Scorpions ............................................................................................................................ 17 3.4.5 Centipedes .......................................................................................................................... 17 3.4.6 Millipedes ............................................................................................................................ 21 3.4.7 Terrestrial slaters ................................................................................................................ 21 3.4.8 Snails ................................................................................................................................... 21 3.5 Listed species or PECs at the Project ......................................................................................... 22 4. RECONAISSANCE SURVEY .......................................................................................................... 22 4.1 Field and Laboratory Methods ..................................................................................................