28 28 In 2004 Omya started a biodiversity pr oject with WWF Austria to evaluate the impact of its r estoration r ena turation practices at Gummer n with the aim to adopt best practices With the help of a local school part of former Gummer n quarry was transformed into a wetlands natur e r eserve hosting now multiple rar e and endanger ed species as eg the yellowbellied toad or the Eur opean gr een lizar d R e n at ur at i o n at G um m e r n A u s t r i a endanger ed plants ar e monitor ed and pr otected as part of a Longterm Biodiversity Index LBI at Gummer n 16