The Roșia Poieni copper mine is a large open pit copper mine in the centre of Romania, 90 km (56 mi) northwest of Alba Iulia and 484 km (301 mi) north of the capital, Bucharest.

Geographically the mine is located in the Apuseni Mountains, 7 km (4.3 mi) south of the Arieș River in Lupșa commune.

[1] The eruptive body comes in contact (through the tectonic breccia) with andesite necks (Poieni, Curmătura, Melciu, Piatra Tichileu, and Jgheabului Hills) and with sedimentary Cretaceous rocks.

[1] The porphyry copper deposit is made up mainly of fine disseminations, nests and veinlets (0.02÷3 cm) of pyrite, chalcopyrite, and magnetite; gold included in the chalcopyrite and pyrite, and secondary minerals: bornite, covellite, chalcocite, sphalerite, galena, molybdenite, germanite, malachite, azurite and is developed in microdioritic rocks.

The ore is subsequently processed through a classical processing flow, with a two-stage grinding phase in two autogenous mills and in two ball mills, followed by flotation, which is performed in pneumomechanical cells (17 m2 (180 sq ft)) where the primary concentrate is obtained, which subsequently is flotated in cells of 5.7 m2 (61 sq ft) where a copper concentrate is obtained with a content between 16.5 and 20% copper.