Canada

Goderich Operation

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Categories

Overview

Mine TypeUnderground
Commodities
  • Salt (rock)
Mining Method
  • Continuous
  • Room-and-pillar
  • Undefined backfill
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Mine Life2094
ShapshotThe Goderich mine is the largest underground rock salt mine in the world.

Goderich Operation consists of Goderich Salt Mine(Rock salt mined) and Goderich Plant (produced Evaporated Salt product).

The underground mine Cote Blanche is operated with modern mining equipment and utilizes subsurface improvements, such as vertical shaft lift systems, milling and crushing facilities, maintenance and repair shops and extensive raw materials handling systems.
Related Asset

Owners

SourceSource
CompanyInterestOwnership
Compass Minerals International Inc. 100 % Indirect
Sifto Canada Corp. (operator) 100 % Direct

Contractors

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Deposit type

  • Sedimentary

Summary:

The Goderich Salt Mine is located near the east edge of the Michigan salt basin. The stratigraphy consists of a sedimentary rock sequences which includes salt evaporates (or halites) contained within the Silurian-age Salina formation. The Silurian dolomites, shales, and evaporites are overlain by the dolomites and limestones of Devonian-age and underlain by Ordovician limestones and shales. The Salina group is classified into units in ascending order from A to G.

The sediments of the Salina formation approach 3,000 ft (900 m) maximum thickness near the basin depositional center thinning out to several hundred meters or less on the basin margins where the salt is absent. The aggregate thickness of the salt in the Salina formation can exceed 2,000 ft (600 m) in the thickest sequences in the depositional center of the basin, thinning out to zero at the basin margins. The salt strata are highly continuous over the basin, and most of the major salt units can be traced for hundreds of kilometers.

In the Goderich area, the aggregate thickness of the Salina formation is about 1,000 ft (300 m), of which approximately 40% consists of salt beds, with the B unit salt being the dominant salt bed.

The geological interpretation assumes that the A-2 evaporite salt bed is continuous and potentially thickens to the west towards the center of the Michigan basin. The regional stratigraphic sequence is well understood from many wells drilled across the basin and locally in the Goderich area. The salt strata are highly continuous over the basin, and most of the major salt units can be traced for hundreds of kilometers.

On a local scale, the continuity of the salt beds can be impacted by the presence of pinnacle reefs, displacement by faults, or the local leaching of salt. The Company can use various tools to characterize geological conditions in nearby areas to assess the possibility of encountering these local ground conditions at the mine.

Mineral Deposit Type
The Goderich Salt Mine is situated in the A-2 salt bed. The A-2 salt is immediately overlain by the A-2 carbonate sequence and underlain by the A-1 carbonate sequence. The base of the A-2 salt bed is located approximately 1,750 ft to 1,760 ft below surface at the mine shafts’ location.

The A-2 salt bed in the shaft area is approximately 79 ft thick. Other salt beds above the mine consist of B, D, and F salt beds at progressively shallower depths. The upper most F salt bed is about 980 ft below surface at the shafts’ locations. The salt beds are nearly horizontal and dip at approximately 1.5° to the southwest.

The A-2 salt contains parting features that may be encountered during mining or present stability challenges when shallow in the roof. The clay partings often exhibit rippled surfaces. The features tend to be weak and roof separation is common when located immediately above the roof at room center. The dolomite / anhydrite / clay bands’ (commonly referred to as rock bands) thickness ranges from thin lamina (less than one quarter inch) and four to six inches. The frequency and thickness of the rock bands increase near the top and the bottom of the A-2 salt. Slumping or folding structures within the salt are common.

The rock of the A-2 carbonate bed, which overlies the A-2 salt, is a dolomite. The thickness of the A-2 carbonate bed is about 140 ft and the bedding has prominent partings that range in spacing from less than one inch and one to two feet. The estimated cohesive strength at bedding features is very low. There is little evidence of cross fracturing or jointing within the dolomite. The rock is prone to raveling as observed in areas where it has been exposed in the mine roof.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

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Processing

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Production

CommodityUnits2023202220212020201920182017
Salt (rock) kt 000000000000000000003,5224,768
All production numbers are expressed as de-icing salt.

Operational metrics

Metrics202320222021202020192018
Annual production capacity 000000000000000000000000000000140,000 tons of salt (evaporated)
Annual production capacity 000000000000000000000000000000000008,000,000 tons of salt (rock) de-icing salt
Daily production capacity 0000000000

Production Costs

CommodityUnits20212020201920182017
Total cash costs Salt (rock) USD 00 000 37.9 / ton   51.3 / ton   38.7 / ton  

Financials

Units20212020201920182017
Capital expenditures M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe 30.8   57  
Revenue M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe 263.7   285.6  

Heavy Mobile Equipment

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Personnel

Mine Management

Source Source
Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Feb 13, 2024
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....................... Subscription required ....................... Subscription required Subscription required Feb 15, 2024
....................... Subscription required ....................... Subscription required Subscription required Feb 13, 2024
....................... Subscription required ....................... Subscription required Subscription required Feb 13, 2024

EmployeesYear
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017

Aerial view:

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