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Four Corners Mine
(
Florida phosphates Operation
)
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devices with screen width under 750 px.
Location:
50 km SE from Tampa, Florida, United States
Address:
11200 R. 37 South
Bradley
Florida, United States
33835
...
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Overview
Stage
Production
Mine Type
Open Pit
Commodities
Phosphate rock
Mining Method
Dragline
Production Start
...
Mine Life
2032
Owners
Source:
p. 1-3
Company
Interest
Ownership
The Mosaic Company
100 %
Indirect
Mosaic Fertilizer, LLC
(operator)
100 %
Direct
Contractors
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Deposit Type
Sedimentary
Summary:
The entirety of Mosaic’s mineral reserves and resources exist within sedimentary deposits. Economic phosphorite exists in a matrix of gravels, sands, silts and clays that are readily extractible. These economic deposits overlay a carbonate platform where phosphorite is absent. The bedrock and economic matrix are overlain by sands, clays and silts that are easily removed. Limitations of extraction arc the case of excavation, the capacity of the matrix to slurry, the grade of the phosphorite, gangue minerals, the depth of the matrix, and the overburden to be removed.
Deposition of phosphorite occurred in the Miocene and Pliocene epochs. The depositional environment was shallow marine with sea levels of 300 ft. (100 m) or less. Cold phosphate rich waters were upwelled and mixed with warm surface waters creating vigorous biologic activity. Biological remains settled on the sea floor in regional anoxic zones. Phosphate subsequently substituted into calcium carbonate in the form of the mineral francolite. Accessory- mineralization does occur, but it is of little economic consequence. The deposit underwent transport and rework through marine winnowing. Post-depositional rework is extensive and site factors such as hydrology and groundwater geochemistry influence grade and gangue mineralization.
Gangue minerals are generally limestone, dolomitic limestone, iron concretions of varying sizes and competent clays that resist disaggregation by washing. Limestone, dol ........
Mining Methods
Dragline
Summary:
Four Corners is a phosphates production stage mining facility. Phosphate is extracted using surface mining techniques. Mining is utilizing electric walking draglines to remove overburden and mine the phosphate ore (matrix). The matrix is hydraulicaly transported to the benefication plants via a series of centrifugal pumping systems.
Draglines utilize a one-pass. modified simple side-cast method for overburden removal and mining of matrix. Overburden will be spoiled on top of the ground, in an adjacent mined out cut or pumped, depending on overburden matrix thickness and available area. Geological considerations such as overburden matrix thickness, spoil stacking characteristics and dragline reach arc considered in cut design to ensure spoiled overburden does not encroach on uncovered matrix.
Regardless of the cut type and spoil placement, matrix is mined in a consistent manner. An earthen well is formed with earthmoving equipment outside of the dragline cut but within the dragline dumping radius. After the dragline uncovers an advance of approximately 50 ft. (16 m). matrix is mined and placed in the well where it is slurried with 10.000 US gpm of water at high pressure (250 to 3(X) psi). Once all matrix is mined, the dragline walks back and repeats the process. While the dragline generally advances in one direction the tub follows an arc within the cut as the dragline is dumping matrix to a fixed location. Once the dragline advances past the reach of th ........
Crushing and Grinding
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Processing
Flow Sheet:
Summary:
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Production
:
Commodity
Units
2020
2019
2018
2017
2016
2015
Phosphate rock
kt
......
......
6,900
6,400
5,300
5,700
All production numbers are expressed as concentrate.
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Operational Metrics:
Metrics
2020
2019
2018
2017
2016
Annual production capacity
......
7 Mt of phosphate rock concentrate
7 Mt of phosphate rock concentrate
7 Mt of phosphate rock concentrate
7 Mt of phosphate rock concentrate
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Reserves at December 31, 2021:
Category
Tonnage
Commodity
Grade
Proven
42 Mt
P2O5
28.3 %
Probable
36 Mt
P2O5
27.2 %
Proven & Probable
78 Mt
P2O5
27.8 %
Pipelines
Type
Material
Diameter
Length
Description
Heavy Mobile Equipment as of December 31, 2021:
HME Type
Size
Quantity
Dragline
65 cu. yd
.......................
Dragline
55 cu. yd
.......................
Dragline
42 cu. yd
.......................
Dragline
40 cu. yd
.......................
Dragline
45 cu. yd
.......................
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Mine Management:
Job Title
Name
Phone
Profile
Ref. Date
.......................
.......................
.......................
Jun 30, 2022
.......................
.......................
.......................
Feb 3, 2020
.......................
.......................
.......................
Jun 30, 2022
.......................
.......................
Jun 30, 2022
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Staff:
Total Workforce
Year
2021
2020
2019
2018
2017
2016
Corporate Filings & Presentations:
Document
Year
...................................
2021
...................................
2021
...................................
2021
...................................
2020
...................................
2020
...................................
2020
...................................
2019
...................................
2019
Form 10-K
2018
Form 10-K
2017
Form 10-K
2016
Project Description
2016
Form 10-K
2015
Technical Report
1993
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