Crushed stone processing

Download the crushed stone processing calculator to help you estimate the releases of National Pollutant Release Inventory (NPRI) substances.

Crushed stone processing releases criteria air contaminants (Part 4 substances).

The calculator focusses on releases to air and uses default emission factors. It can be adapted to use site-specific emission factors if they are available. If you want to use a site-specific emission factor, enter it in the emission factor column, but be sure to convert the units correctly.

The spreadsheet calculators use emission factors based on uncontrolled emission sources. If you use an emission control device and the default emission factor is uncontrolled, use this formula to adjust the spreadsheet calculation:

Controlled emissions = uncontrolled emission x ((100 - control efficiency)/100)

Since NPRI reporting thresholds are for the facility as a whole, you may need to combine the air releases you calculate with releases from other sources at your facility.

The following sections explain how the spreadsheet calculator works.

Suggested estimation methodology: emission factor

The general equation for estimation using an emissions factor is:

E = A x EF

where:

E = emissions
A = activity rate
EF = emission factor

The total emissions for each of total particulate matter (TPM), particulate matter less than or equal to 10 micrometers (µm) (PM₁₀) and particulate matter less than or equal to 2.5 µm (PM_2.5) are calculated by summing all individual emissions calculated for each substance from each process.

Input data

A = throughput processed (tonnes/year)

Throughput is measured either as material processed or as raw material processed. The tables below show the type of throughput used for the calculation based on the process used to crush the stone and whether it is controlled or not.

Uncontrolled
Process	Activity
Primary crushing	Material processed
Secondary crushing	Material processed
Tertiary crushing	Material processed
Fine crushing	Material processed
Screening	Material processed
Fines screening	Material processed
Conveyor transfer point	Raw material processed

Note: "Uncontrolled" refers to processing of material with a moisture content below 1.5%. When the moisture content of the processed material is <1.5 %, complete the uncontrolled process throughput section of the input information tab.

Controlled
Process	Activity
Primary crushing	Material processed
Secondary crushing	Material processed
Tertiary crushing	Material processed
Fine crushing	Material processed
Screening	Material processed
Fines screening	Material processed
Conveyor transfer point	Raw material processed

Note: "Controlled" refers to the processing of material, either naturally wet with a moisture content above 1.5% or moistened to 1.5% and above with wet suppression techniques. When the moisture content of the process material is ≥ 1.5 %, complete the controlled process throughput section of the input information tab.

Substance releases

Part 4 criteria air contaminants releases

Primary crushing
Substance	Emission factor (EF)^{Footnote 1}	EF units
TPM – Uncontrolled	0.0027	Kilograms (kg)/tonne
TPM – Controlled^{Footnote *}	0.0006	kg/tonne
PM₁₀ – Uncontrolled	0.0012	kg/tonne
PM₁₀ – Controlled^{Footnote *}	0.00027	kg/tonne
PM_2.5 – Uncontrolled	0.0006	kg/tonne
PM_2.5 – Controlled^{Footnote *}	0.00005	kg/tonne

Secondary crushing
Substance	Emission factor (EF)^{Footnote 1}	EF units
TPM – Uncontrolled	0.0027	kg/tonne
TPM – Controlled^{Footnote *}	0.0006	kg/tonne
PM₁₀ – Uncontrolled	0.0012	kg/tonne
PM₁₀ – Controlled^{Footnote *}	0.00027	kg/tonne
PM_2.5 – Uncontrolled	0.0006	kg/tonne
PM_2.5 – Controlled^{Footnote *}	0.00005	kg/tonne

Tertiary crushing
Substance	Emission factor (EF)^{Footnote 1}	EF units
TPM – Uncontrolled	0.0027	kg/tonne
TPM – Controlled^{Footnote *}	0.0006	kg/tonne
PM₁₀ – Uncontrolled	0.0012	kg/tonne
PM₁₀– Controlled^{Footnote *}	0.00027	kg/tonne
PM_2.5 – Uncontrolled	0.0006	kg/tonne
PM_2.5 – Controlled^{Footnote *}	0.00005	kg/tonne

Fine crushing
Substance	Emission factor (EF)^{Footnote 1}	EF units
TPM – Uncontrolled	0.0195	kg/tonne
TPM – Controlled^{Footnote *}	0.0015	kg/tonne
PM₁₀– Uncontrolled	0.0075	kg/tonne
PM₁₀ – Controlled^{Footnote *}	0.0006	kg/tonne
PM_2.5 – Uncontrolled	No Data (ND)	kg/tonne
PM_2.5 – Controlled^{Footnote *}	0.000035	kg/tonne

Screening
Substance	Emission factor (EF)^{Footnote 1}	EF units
TPM – Uncontrolled	0.0125	kg/tonne
TPM – Controlled^{Footnote *}	0.0011	kg/tonne
PM₁₀ – Uncontrolled	0.0043	kg/tonne
PM₁₀ – Controlled^{Footnote *}	0.00037	kg/tonne
PM_2.5 – Uncontrolled	ND	kg/tonne
PM_2.5 – Controlled^{Footnote *}	0.000025	kg/tonne

Fines screening
Substance	Emission factor (EF)^{Footnote 1}	EF units
TPM – Uncontrolled	0.15	kg/tonne
TPM – Controlled^{Footnote *}	0.0018	kg/tonne
PM₁₀ – Uncontrolled	0.036	kg/tonne
PM₁₀ – Controlled^{Footnote *}	0.0011	kg/tonne
PM_2.5 – Uncontrolled	ND	kg/tonne
PM_2.5 – Controlled^{Footnote *}	ND	kg/tonne

Conveyor transfer point
Substance	Emission factor (EF)^{Footnote 1}	EF units
TPM – Uncontrolled	0.0015	kg/tonne
TPM – Controlled^{Footnote *}	0.00007	kg/tonne
PM₁₀ – Uncontrolled	0.00055	kg/tonne
PM₁₀ – Controlled^{Footnote *}	2.30E-05	kg/tonne
PM_2.5 – Uncontrolled	ND	kg/tonne
PM_2.5 – Controlled^{Footnote *}	6.50E-06	kg/tonne

Page details

Date modified:: 2023-03-01

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