Alcoa 2015 Annual Report Download - page 32

Mine & Location
Means of
Access Operator
Title,
Lease or
Options History
Type of
Mine
Mineralization
Style Power Source
Facilities,
Use &
Condition
Brazil—MRN.
Closest town is
Trombetas in the
State of Pará, Brazil.
The mine and port
areas are
connected by
sealed road and
company owned
rail.
Washed ore is
transported to
Porto Trombetas
by rail.
Trombetas is
accessed by river
and by air at the
airport.
MRN Mining rights and
licenses from the
Government of
Brazil.
Concession rights
expire in 2046.
Mining began in
1979.
Major expansion in
2003.
Open-cut mines.
Bauxite derived
from weathering
during the Tertiary
of Cretaceous fine
to medium grained
feldspathic
sandstones.
The deposits are
covered by the
Belterra clays.
MRN generates
its own
electricity from
fuel oil.
Ore mined from several plateaus
is crushed and transported to the
washing plant by long-distance
conveyors.
The washing plant is located in
the mining zone.
Washed ore is transported to the
port area by company-owned
and operated rail.
At Porto Trombetas the ore is
loaded onto customer ships
berthed in the Trombetas River.
Some ore is dried and the drying
facilities are located in the port
area.
Mine planning and services and
mining equipment workshops
are located in the mine zone.
The main administrative, rail
and port control offices and
various workshops are located in
the port area.
MRN’s main housing facilities,
“the city”, are located near the
port.
The mines, port and all facilities
are operating.
Guinea—CBG.
Closest town to the
mine is Sangaredi.
Closest town to the
port is Kamsar. The
CBG Lease is
located within the
Boké, Telimele and
Gaoual
administrative
regions.
The mine and
port areas are
connected by
sealed road and
company-operated
rail. Ore is
transported to the
port at Kamsar by
rail. There are air
strips near both the
mine and port.
These are not
operated by the
company.
CBG CBG Lease expires in
2038. The lease is
renewable in 25-year
increments. CBG’s
rights are specified
within the Basic
Agreement and
Amendment 1 to the
Basic Agreement
with the Government
of Guinea.
Construction began
in 1969.
First export ore
shipment was in
1973.
Open-cut mines.
The bauxite deposits
within the CBG
lease are of two
general types.
TYPE 1: In-situ
laterization of
Ordovician and
Devonian plateau
sediments locally
intruded by dolerite
dikes and sills.
TYPE 2: Sangaredi
type deposits are
derived from clastic
deposition of
material eroded
from the Type 1
laterite deposits and
possibly some of the
proliths from the
TYPE 1 plateaus
deposits.
The company
generates its
own electricity
from fuel oil at
both Kamsar
and Sangaredi.
Mine offices, workshops, power
generation and water supply for
the mine and company mine city
are located at Sangaredi.
The main administrative offices,
port control, railroad control,
workshops, power generation
and water supply are located in
Kamsar. Ore is crushed, dried
and exported from Kamsar. CBG
has company cities within both
Kamsar and Sangaredi.
The mines, railroad, driers, port
and other facilities are operating.
Kingdom of Saudi
Arabia—Al Ba’itha
Mine. Qibah is the
closest regional
centre to the mine,
located in the
Qassim province.
The mine and
refinery are
connected by road
and rail. Ore is
transported to the
refinery at Ras
Al Khair by rail.
Ma’aden
Bauxite &
Alumina
Company
The current mining
lease will expire in
2037.
The initial
discovery and
delineation of
bauxite resources
was carried out
between 1979 and
1984.
The southern zone
of the Az Zabirah
deposit was
granted to
Ma’aden in 1999.
Mine construction
was completed in
the second quarter
of 2015, and the
mining operations
continued at
planned levels.
Open-cut mine.
Bauxite occurs as a
paleolaterite profile
developed at an
angular
unconformity
between underlying
late Triassic to early
Cretaceous
sediments (parent
rock sequence
Biyadh Formation)
and the overlying
late Cretaceous
Wasia Formation
(overburden
sequence).
The company
generates
electricity at
the mine site
from fuel oil.
The mine includes fixed plants
for crushing and train loading;
workshops and ancillary
services; power plant; and water
supply.
There is a company village with
supporting facilities. Mining
operations commenced in 2014.
Mine construction was
completed in the second quarter
of 2015 and the mining
operations continued at planned
levels.
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