Ernst and Young rejects allegations it overvalued Tahmoor coal mine project by hundreds of millions TueTuesday 2 updated MonMonday 8 MarMarch 2021 at 9:06am Tahmoor colliery is expected to run out of coal in 18 months if an expansion is not approved. ( Share Print text only Cancel One of the "big four" consulting firms has rejected claims it ignored a landmark court ruling and inflated the value of a mining project by hundreds of millions of dollars. Key points: The Australia Institute has accused Ernst and Young (EY) of overstating the value of a coal mine expansion by hundreds of millions of dollars EY has defended its assessment methodology claiming it aligns with planning guidelines