Aer Si Hajo (also Air Si Hajo) is a copper-ore locality in the Residency of Atjeh recorded in Van Bemmelen’s *Geology of Indonesia* (1949) in the key to Fig. 33 (the map of copper occurrences in the East Indies), based on the 1922 survey of Jansen, Lindberg and Wolvekamp. The locality is listed under the Residency of Atjeh, but the printed source gives no further particulars — no locality description, no assay, and no reserve estimate — and it is accordingly recorded only as a point on the map of Atjeh copper occurrences.
Place in the Atjeh copper record
For the wider context of the Atjeh copper occurrences see the entry on Copper in Atjeh. Aer Si Hajo is one of the six Atjeh copper localities recorded in Van Bemmelen’s Fig. 33 key — alongside Pulu Bras, Gle Broë, Aer Talu, Beutong and Aloe Baru — all of which are listed without detailed geological description, indicating that the Jansen-Lindberg-Wolvekamp 1922 survey recorded them only as points on the map without further investigation.
Significance
Aer Si Hajo is significant for the encyclopedia of Acheh history because it is one of the six canonical Atjeh copper localities of the colonial geological literature, and its inclusion in Van Bemmelen’s Fig. 33 key — despite the absence of detailed geological description — establishes it as part of the documented colonial-era copper record of Atjeh. The locality is part of the broader East-Indian copper record, in which workable deposits had not been found by the end of the colonial period, and is accordingly best understood as part of the wider mineral geography of the residency rather than as a stand-alone copper resource.
See Also
- Acheh
- Aer Talu
- Aloe Baru
- B. B. Lindberg
- Beutong
- Copper in Atjeh
- Gle Broë
- H. Wolvekamp
- P. J. J. Jansen
- Pulu Bras
- Van Bemmelen’s The Geology of Indonesia (1949)
- 1922
Source
The Geology of Indonesia, by R. W. van Bemmelen, Vol. II: Economic Geology (The Hague: Government Printing Office; Martinus Nijhoff, 1949), pp. 147–149 (copper in Sumatra, Fig. 33 key, with the Atjeh localities).