Table 1 Locations of the wells that were sampled in 2017 for this study and the bedrock type that hosts them

Well name	WAB188	WAB105	WAB104	WAB55	NSHQ4	WAB71	NSHQ14B/C
pH	7.6^a	8.3^a	8.5	9.2	10.5^b	10.6	11.1/11.3
UTM Easting	671,123	644,678	643,099	634,777	670,971	670,322	675,495
UTM Northing	2,529,798	2,536,524	2,541,124	2,506,101	2,531,699	2,533,981	2,529,716
Bedrock type	Contact	Peridotite	Peridotite	Contact	Contact	Peridotite	Peridotite
Fluid type	Contact	Alkaline peridotite	Alkaline peridotite	Contact	Hyperalkaline peridotite	Hyperalkaline peridotite	Hyperalkaline peridotite
Elevation (m)	514	688	842	531	514	608	526

Bedrock type is as reported in Rempfert et al. [5]. A “contact” bedrock type describes wells that are near the contact between gabbro-dominated and peridotite-dominated lithologies. The pH of NSHQ14B (50 m depth) and NSHQ14C (85 m depth) are separated by a slash. The elevation of each well is listed in meters above sea level
^a Data collected from wells in 2016 are reported since measurements were not collected during the 2017 field season
^b Data collected from wells in 2015 are reported since measurements were not collected during the 2016 or 2017 field seasons

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