The Oranje Nassau IV (located in Heerlerheide, Heerlen), the last and smallest mine exploited by the Oranje Nassau Mijnen, started its life as a ventilation shaft for Oranje Nassau III. In 1910 the construction of a mine shaft was started. However the construction was halted and only reassumed in 1919. In 1927 the mine became operational.

Oranje Nassau Mijn IV

This image of Shaft 2 of Oranje Nassau I, gives an idea of how the shaft of ON-IV looked.
Location
Oranje Nassau Mijn IV Location in the Netherlands
Location	Heksenberg, Heerlen
province	Limburg
Country	Netherlands
Coordinates	50°54′59″N 5°58′37″E / 50.91639°N 5.97694°E / 50.91639; 5.97694
Production
Products	Coal
Production	13,754,000 tons
History
Opened	1927; 97 years ago (1927)
Closed	1966; 58 years ago (1966)
Owner
Company	Oranje Nassau Mijnen

Underground, the mine was connect to the Oranje Nassau III and, for safety reasons, also the Staatsmijn Hendrik. In 1966 it became the first of the Oranje Nassau mines to close; however, via Oranje Nassau III mining activities continued till 1973.

In its short life it produced 13,754,000,000 kilograms (3.0322×10¹⁰ lb) of coal. The mine was 740 metres (2,430 ft) deep.

The terrain is now used by the Sigrano, a silversand mine, part of Sibelco [nl].