ASX-listed budding manganese producer, Element 25, has come out with even more “compelling” financial metrics for its developing Butcherbird mine 130km south of Newman in WA's southern Pilbara region after the company completed a fine-tuning of the project's pre-feasibility study. The revised base-case net present value and internal rate of return for the project now stand at $583 million before tax and 387 per cent, respectively.