Experimental determination of the hydrothermal solubility of ReS2 and the Re–ReO2 buffer assemblage and transport of rhenium under supercritical conditions

Table 5 Predictions and field observations of potential size of rhenium mineralization in porphyry copper–molybdenum and Skarn tungsten–molybdenum systems

Predictions and field observations	T/°C	Solubility controlling phase	log	log	pH	log a_Cl-	Log aΣ_S	Transportable re assuming saturation with solid phase in grams	Remarks and references for thermodynamic parameters
This study	400 to 500	ReS₂	-26.9 to -21.6	-7.6 to -4.8	5.0, KMQ to 5.2, KMQ	-1.5 to -2.3	-1. 2 to 0	Typical porphyry Cu–Mo systems: ~2 × 10⁸ to ~6 × 10⁸ (~2 × 10¹⁰ to ~6 × 10¹⁰ for giant porphyry Cu–Mo systems) Skarn W–Mo systems: ~4 × 10⁷ to ~1.2 × 10⁸	Log , log and log aΣ_Sare calculated from MPP buffer^d
Porphyry copper–molybdenum	350 to 550	Solid solution of ReS₂ and MoS₂	-26.5 to -16.5^a	PP buffer^b	KMQ buffer^c	-1.0	-1.0	~4 × 10¹⁰ (El Teniente, giant porphyry Cu–Mo)	ref. 40
								~8 × 10⁶ (La Disputada, typical porphyry Cu–Mo)
Skarn tungsten–molybdenum system	400 to 650	Solid solution of ReS₂ and MoS₂	-24.1 to -22.1	-8.2 to -6.25	KMQ and WQ buffers^e	0.17 to >1.4 (log m_NaCl)^f	~-0.4^g	~4 × 10⁷	ref. 32

^aMagnetite–hematite buffer. ^bPP: pyrite–pyrrhotite buffer. ^cKMQ: K–feldsparmuscovite–quartz buffer. ^dMPP: magnetite–pyrite–pyrrhotite buffer. ^eWQ: wollastonite–quartz buffer, which should buffer pH values in near-neutral range as mentioned in the text. ^fConverted from salinity ranging from >60 wt% NaCl eq. to ~8 wt% NaCl eq. ^gAs log m_Feso4, King Island.

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