A significant part of the economic activity in the province involves the development of natural resources, including forestry and numerous local mining ventures. Some of the activity is controversial, however, because regulatory controls over the use of natural resources are not always effective. There have been disputes in some areas over the use of land. Manganese mining, for example, in the central part of the island of Timor has been controversial. Nearby, in the Mount Mutis area to the east of Kupang, amongst some local groups there is a concern at the way local resources are being developed by mining companies.