At the request of the NSW Office of Environment and Heritage, Hector Abrahams Architects wrote a report analysing the heritage significance of both the rural estate, Tarwyn Park and the Bylong Valley where it is located.

With origins in the 19th century, Tarwyn Park is the site where the important land conservation method known as Natural Sequence Farming was developed in the 1970s. The report investigated the impact a proposed coal mine would have on the cultural landscape that was significant to the homestead and the larger Bylong Scenic Landscape.

In September 2019 the NSW Independent Planning Commission refused the development of the coal mine on the grounds that it was contrary to the principles of ESD (ecologically sustainable development).