5
Gold Fields 2018 Operating Update March Quarter
Review of Operations
Quarter ended 31 March 2018 compared
with quarter ended 31 December 2017
South Africa region
South Deep Project
March
2018
Dec
2017
Gold produced
000’oz
47.7
80.8
kg
1,485
2,512
Gold sold
000’oz
53.9
80.4
kg
1,675
2,500
Yield – underground reef
g/t
4.74
6.04
AISC R/kg
643,021
532,573
US$/oz
1,666
1,209
AIC R/kg
677,495
576,043
US$/oz
1,755
1,310
Gold production decreased by 41 per cent from 2,512 kilograms
(80,800 ounces) in the December quarter to 1,485 kilograms
(47,700 ounces) in the March quarter mainly due to lower volumes
mined partially attributable to labour restructuring and new shift
system implementation with the associated disruptions in terms of
crew briefings and transition to the new shift cycles. Over and
above these factors, the March quarter is characterised by the
extended Christmas break, typical of South African based mines.
On 1 March 2018 the shift roster was changed from 9.5 hours to
11.5 hours to optimise face time. There were initial teething
problems and the benefits are yet to be realised. D and E band
restructuring commenced in October 2017 and was concluded by
end January 2018 with 25 per cent of employees in this category
exiting the business. Subsequently, a further 260 employees from
the bargaining unit also exited the business.
In December 2017 there was no voluntary production work
conducted over the Christmas Break as planned engineering
maintenance work was required on critical infrastructure.
Total underground tonnes mined decreased by 21 per cent from
394,000 tonnes in the December quarter to 313,000 tonnes in the
March quarter. Ore tonnes mined decreased by 24 per cent from
336,000 tonnes to 255,000 tonnes, while underground waste
mined remained similar at 58,000 tonnes. Total gold mined from
underground decreased by 25 per cent from 2,006 kilograms
(64,500 ounces) to 1,504 kilograms (48,400 ounces). Grade mined
decreased by 6 per cent per cent from 5.10 grams per tonne to
4.80 grams per tonne mainly due to more waste mined in New Mine
Development and lower volumes mined from higher grade areas.
Total tonnes milled decreased by 27 per cent from 557,000 tonnes
to 407,000 tonnes. Underground ore tonnes milled decreased by
25 per cent from 414,000 tonnes in the December quarter to
311,000 tonnes in the March quarter. Underground waste milled
decreased by 18 per cent from 39,000 tonnes to 32,000 tonnes.
Surface tailings material treated decreased by 38 per cent from
104,000 tonnes to 64,000 tonnes. Underground reef yield
decreased by 22 per cent from 6.04 grams per tonne to 4.74 grams
per tonne due to more waste mined in New Mine Development and
lower volumes mined from higher grade areas.
Ore milled was higher than ore mined due to tramming of additional
underground stocks.
Gold recovered from underground was 1,475 kilograms (47,400
ounces) with 10 kilograms (300 ounces) being recovered from
treatment of the surface material.
Destress mining decreased by 27 per cent from 9,619 square
metres in the December quarter to 7,061 square metres in the
March quarter mainly due to geological feature intersections and
the impact of the extended Christmas break.
Longhole stoping decreased by 33 per cent from 173,400 tonnes
to 116,300 tonnes due to constraints associated with secondary
stopes and the introduction of more rigid quality control procedures
and compliance to planned extraction. The current mine
contributed 78 per cent of the total ore tonnes in the March quarter
compared with 73 per cent in the December quarter. The longhole
stoping method accounted for 37 per cent of total tonnes mined in
the March quarter compared with 44 per cent in the December
quarter.
Development decreased by 16 per cent from 1,935 metres in the
December quarter to 1,617 square metres in the March quarter
.
New mine capital development on 100 level increased by 11 per
cent from 304 metres to 337 metres. New mine development is
focused on infrastructure projects exclusively on 100 level and
related to haulage extensions, crusher excavations and conveyor
extensions. D
evelopment in the current mine areas in
creased by
11
per cent from 833 metres to 923
metres. Development North of
Wrench decreased
by 55
per cent from 798 metres to 357 metres
largely due to insufficient power capacity and as a result of Corridor
3 Cut 4 that was stopped as it approached the abutment of Corridor
3 Cut 3.
Net operating costs decreased by 7 per cent from R1,027 million
(US$75 million) to R952 million (US$79 million) mainly due to lower
production, lower bonuses, overtime and consumables cost and a
decrease in the gold-in-process charge from R51 million (US$4
million) in the December quarter to R25 million (US$2 million) in the
March quarter.
Capital expenditure decreased by 62 per cent from R412 million
(US$30 million) in the December quarter to R156 million (US$13
million) in the March quarter.
Sustaining capital expenditure decreased by 68 per cent from
R303 million (US$22 million) in the December quarter to R98 million
(US$8 million) in the March and non-sustaining capital expenditure
decreased by 47 per cent from R109 million (US$8 million) to R58
million (US$5 million), both due to scheduling.
All-in sustaining costs increased by 21 per cent from R532,573 per
kilogram (US$1,209 per ounce) in the December quarter to
R643,021 per kilogram (US$1,666 per ounce) in the March quarter
mainly due to lower gold sold, partially offset by lower net
operating costs and lower sustaining capital expenditure.
Total all-in cost increased by 18 per cent from R576,043 per
kilogram (US$1,310 per ounce) in the December quarter to
R677,495 per kilogram (US$1,755 per ounce) in the March quarter
due to the same reasons as for all-in sustaining costs and lower
non-sustaining capital expenditure.