This one-meter interval is a mafic schist containing coarse 2 cm size cubic pyrite in a chocolate coloured presumed ankerite
alteration zone that includes a 0.4 meter rubble interval with pyrite.
In some dolomitized zones, the dolomite rhombs are brownish red colored and might be implying the presence of Ankerite
The TG curve was relatively smooth, and the pyrolysis of carbonates, including calcite, dolomite and abundant ankerite
, chiefly occurred at temperatures higher than 630 [degrees]C.
The diagenetic minerals in Chang 7 sandstone are mainly included Fecalcite, ankerite
, quartz followed by minor calcite, dolomite, albite, kaolin, and chlorite rims.
It can be seen from the figure that the kaolin clay is predominated with kaolinite mineral peaks along with a peak pertaining to calcite and ankerite
. Dissolution of peaks pertaining to calcite and ankerite
can be seen from acid contaminated kaolin clays.
, and anorthose are the main rock-forming minerals of the sandstone.
Deep burial diagenetic processes led to the precipitation of different cement phases, including ankerite
and anhydrite cements, which represent several percentages of the total bulk rock volume, occasionally reaching up to 17% [54, 58, 59].
Upon closing, McEwen Mining owns 100% interest in the Buffalo Ankerite
, Fuller and Davidson Tisdale properties, and a 61% interest in the Paymaster property, with the remaining 39% of mineral rights held by Goldcorp Inc.
(ferroan dolomite) grains and detrital muscovite flakes 2-5 mm long occur throughout the formation; weathering of the former produces a characteristic pale orange weathering rind.
Caption: Figure 2: X-ray diffraction of the raw coal gangue and coal gangue after acid leach and typical chemical formula of the mineral components: quartz (Si[O.sub.2]), illite (K[Al.sub.2][(Al,Si)[Si.sub.3][O.sub.10]]), kaolinite ([Al.sub.2][Si.sub.2][O.sub.5][(OH).sub.4] ), ankerite
(CaMg[(C[O.sub.3]).sub.2]), mullite (Al6Si2O13), and siderite (FeC[O.sub.3]).
The carbonate cement of sandstones is varying in mineralogy from common ferroan dolomite and ankerite
to less common calcite and siderite (Sliaupa et al.
All seven samples of dark brown and black rock surface deposits were identified as whewellite, with minor amounts of ankerite
, (Ca,Mg,Fe)C[O.sub.3], calcite, and in one case, jarosite, K[Fe.sub.3][(S[O.sub.4]).sub.2][(OH).sub.6] and pyrite Fe[S.sub.2].