Open File Report 60
Introduction and Bottle Creek orientation study - Contribution
to Field Guide, Eastern Goldfields Trip
Anand, R.R., Smith, R.E., Churchward, H.M. and Perdrix, J.L.
Schedule of stops
STOP 1 Erosional regime - walk from mine road to line 14 800 mN,
turn west towards breakaway. Note variability in topography, outcrops,
and lags on erosional surfaces. Lags of quartz, saprock, ferruginous
lithic fragments, iron segregations, ferruginous saprolite and calcrete.
Elements of the regolith-landform mapping units 3, 5, and 6 should
STOP 2 Stable regime from crest (above a low breakaway) down a
long, gentle backslope Continue the walk along line 14 800 mN. Stop
on crest, midslope and lower slope positions. On crest, note coarse
fragments of duricrust of various types, also some nodules and pisoliths
with yellow-brown cutans (skins). Midslope; note finer lag which
is dark brown to black also few if any pisoliths and little, if
any, quartz. Lower slope fine lag. Note contrast with silts of the
narrow alluvial track (mapping unit 9a nearby). Move on to next
stop along 14 800 mN.
STOP 3 Stable regime EMU location. Exposure of deep nodular and
pisolitic lateritic residuum in EMU test pit.
Note deep hardpanization of lateritic residuum
trends downwards from lateritic residuum to mottled zone
types of iron segregations
pisolitic and nodular, Fe-rich, magnetic
yellow brown to red brown mottled to incipiently pisolitic
Commentary by G. F. Taylor on gossans and lithogeochemistry. If
sufficient time, continue along exposures of regolith north of EMU
test pit, noting lateritic residuum, lens-shaped iron segregations,
"fragmentary duricrusts", gossanous materials and trends
in depth to weathered rock.
STOP 4 Towards north end of VB pit - Gossan and lithogeochemistry
- G. F. Taylor
STOP 5 BOAGS mine pit
Greenstone sequence well exposed.
Channel deposit, at north end of decline.
Fine nodular, very gravelly lateritic residuum mid-way along eastern
face of decline.
Pisolitic and nodular lateritic residuum at south end of entrance
to the main pit.
Iron segregations will be noted in the face.
Gossans will be discussed - G. F. Taylor.
Depart Bottle Creek by bus
Last updated: Thursday, January 06, 2000 09:20 AM