Their provision urges the National Institute of Standards and Technology (NIST) to establish regulations for acceptable levels of pyrrhotite
a mineral found in concrete that is suggested to be the cause of the crumbling foundations.
Summary: Norilsk Nickel has reported an unexpectedly weak 1Q17 trading update, with a 5% fall in own nickel production and a 17-28% YoY decline in palladium/platinum output, affected by the slow ramp-up of downstream facilities and also the high dilution in processing its depleting pyrrhotite
concentrate feedstock at Polar division.
The sulphide minerals consist of varying proportions of pyrite, pyrrhotite
and sphalerite with lesser galena, arsenopyrite and chalcopyrite.
Drill testing of six isolated magnetic high anomalies resulted in the intersection of weakly magnetic pyrrhotite
bearing metamorphosed sedimentary rocks.
The Huanzala mine has occasionally produced nice pseudomorphs of arsenopyrite after thin, platy pyrrhotite
A kinetic/mass transport model was proposed based on oxidation of pyrrhotite
Examples are provided for the Muskox Intrusion, Pyrrhotite
Lake, the Fox River sill, the East Bull Lake, Agnew and River Valley intrusions of the Sudbury Basin and finally, the Lac des Isles Intrusion in Ontario, site of our single active Canadian mine producing exclusively PGE.
SEQUENTIAL ALTERATION OF LARGE PYRRHOTITE
CRYSTALS TO MARCASITE, SKELETAL PYRITE, AND GOETHITE IN PEGMATITIC CARBONATITES AND FLUORITE ORES AT OKORUSU, NORTH CENTRAL NAMIBIA.
is the dominant sulphide with concentrations typically an order of magnitude greater than that of pyrite; and
It was determined that the geophysical anomaly was caused by sheared, disseminated pyrrhotite
(iron sulfide), with no significant gold values and only slightly elevated base metal values.
Gold is free or associated with pyrite and pyrrhotite
Two holes at Cotswold (Table 1) intersected felsic volcanic rocks containing abundant pyrite stringers and aggregates, which have subsequently been intensely altered, brecciated, and invaded by hydrothermal fluids rich in amphibole, magnetite, quartz, pyrite, chalcopyrite and pyrrhotite
(see ASX release 29 August 2012).