Stockpile Dust Control and Veneering: Protecting Product, Compliance and Communities
Stockpiles are among the largest exposed surface areas on any mine site, port terminal or quarry. A single iron ore stockpile at a Pilbara port can cover several hectares and contain hundreds of thousands of tonnes of product worth $100+ per tonne. A coal stockyard at a Queensland export terminal can extend across 50+ hectares. A quarry’s product stockpiles — crushed rock, sand, road base, manufactured sand — sit in the open, exposed to every wind event, every storm and every operational disturbance.
Published research in Aerosol and Air Quality Research (Kung et al., 2024) establishes that approximately 50% of global mineral dust aerosol originates from industrial stockpiles and open-pit mines. Wind erosion accounts for approximately 30% of total dust emissions from material storage areas. Industry analysis documents product losses of 3–15% from wind erosion of unprotected stockpiles, depending on the material type, exposure period and wind conditions.
These are not just dust emissions. They are product losses — material that was mined, processed, transported and stockpiled, then lost to the wind before it reached the customer. At a Pilbara port handling 560+ million tonnes per year, even a 0.1% loss to wind erosion represents 560,000 tonnes of iron ore annually. At $100+ per tonne, that is $56+ million in product that literally blew away.
This guide covers every stockpile type, the dual challenges of wind and rain erosion, the product loss and compliance consequences, and the polymer veneering technology that seals the surface, retains the product and maintains compliance — without affecting product quality, reclamation operations or commodity specifications.
Stockpile Types and Their Dust Characteristics
Stockpile dust characteristics by commodity and application
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| Stockpile Type | Material | Dust Propensity | Product Loss Risk | Community Impact | Duration of Storage | GRT Product |
| ROM ore | Run-of-mine; variable sizing | Moderate (coarser fraction) | Lower (pre-processing value) | Moderate | Hours–days (active) | Soil-Loc |
| Processed ore/product | Crushed, screened, sized to spec | High (finer, uniform sizing) | High (full processing cost invested) | High | Days–weeks (dispatch schedule) | Ore-Loc |
| Coal | Thermal or metallurgical coal | Very high (fine particles, low density) | Very high (+ BTU degradation) | Very high (black dust visible) | Days–months | Ore-Loc |
| Mineral concentrate | Fine-ground; high-value | Very high (ultra-fine) | Very high (highest $/tonne) | Moderate (enclosed storage preferred) | Days–weeks | Ore-Loc |
| Quarry aggregate | Crushed rock, sand, road base | High (fine fractions dust-prone) | Moderate | High (near communities) | Weeks–months | Soil-Loc / Ore-Loc |
| Topsoil | Stripped soil for rehabilitation | Moderate–high | Low ($) but high (biological value) | Low | Months–years | Enviro-Binder |
| Waste rock/overburden | Non-product material | Moderate | None (not saleable) | Moderate–high (boundary PM10) | Permanent | Enviro-Binder + Soil-Loc |
The Kung et al. peer-reviewed analysis confirmed that coal and coke stockpiles have a higher propensity to emit dust than other mineral aggregates including limestone, gypsum, iron ore, magnetite and bauxite. Flat-topped stockpiles emit less dust than conical-shaped piles due to reduced wind acceleration over the surface. These findings have direct implications for stockpile design, geometry and treatment priority.
The Dual Threat: Wind Erosion and Rain Erosion on Stockpiles
Wind erosion. Wind above the threshold velocity (typically 5–10 m/s depending on material type and moisture) dislodges fine particles from the stockpile surface through saltation (bouncing) and suspension (carrying into the atmosphere). The dust plume from a large unprotected stockpile in the Pilbara or Bowen Basin can travel kilometres downwind, depositing product on neighbouring properties, waterways and vegetation. Aerison’s analysis estimates that wind erosion accounts for approximately 30% of total dust emissions from storage areas, with documented product losses of 3–15%. This is product that has been mined, processed and is ready for sale — every gram that leaves the stockpile on the wind is lost revenue.
Rain erosion. Rainfall on stockpiles generates sediment-laden runoff that carries both product and contaminants into the site drainage system. For coal stockpiles, the runoff carries coal fines and dissolved organic compounds. For ore stockpiles, the runoff may carry elevated metals. For topsoil stockpiles, the runoff carries the nutrients and seed bank that the soil was stockpiled to preserve. The environmental consequences — contaminated stormwater, sediment discharge, EA non-compliance — are distinct from wind erosion but equally significant. Effective stockpile surface treatment addresses both wind and rain erosion simultaneously.
Oxidation and quality degradation. For coal stockpiles, wind exposure and oxygen infiltration degrade the energy content (BTU value) of the stored material through surface oxidation. Extended storage of unprotected coal reduces the calorific value per tonne, directly lowering the sale price. Polymer surface veneering that creates an oxygen-barrier crust reduces both the dust loss and the quality degradation — protecting both volume and value.
The Product Loss Argument: Dust Is Revenue on the Wind
Illustrative product loss from wind erosion: by commodity and scale
| Commodity | Throughput / Stockpile Volume | Estimated Wind Loss (0.1–1%) | Revenue Lost Annually |
| Iron ore (Pilbara port) | 560 Mtpa throughput | 560,000–5,600,000 t | $56M–$560M at $100/t |
| Metallurgical coal (Bowen Basin) | 20 Mtpa mine | 20,000–200,000 t | $5M–$50M at $250/t |
| Thermal coal (Hunter Valley) | 10 Mtpa mine | 10,000–100,000 t | $1.5M–$15M at $150/t |
| Quarry aggregate | 2 Mtpa quarry | 2,000–20,000 t | $100K–$1M at $50/t |
| Mineral concentrate | 500,000 tpa processing plant | 500–5,000 t | $2.5M–$25M at $5,000/t |
The economics are straightforward. Polymer veneering costs a fraction of a cent per tonne treated. The product it protects is worth $50–$5,000+ per tonne. Even at the lowest loss rate (0.1%), the revenue retained by preventing wind erosion exceeds the cost of the veneering programme by orders of magnitude. The product loss argument alone justifies the investment — the compliance, community and health benefits are the dividends.
How Polymer Stockpile Veneering Works
GRT: Ore-Loc is a polymer-based liquid veneering solution engineered specifically for commodity stockpiles. Applied to the stockpile surface using water trucks, spray cannons or bespoke gantry arrangements, the polymer fuses fine particles on the exposed surface into a thin, bonded, erosion-resistant crust.
Self-targeting surface binding. Ore-Loc penetrates the surface layer of the stockpile material and creates cohesive bonds between the fine particles that wind would otherwise dislodge. The crust that forms is tough enough to resist wind speeds well above the threshold velocity that would strip an unprotected surface.
No product quality impact. The veneering crust is on the surface only — the bulk material beneath is untreated. During reclamation (by reclaimer, front-end loader or dozer), the thin crust is broken and the polymer disperses harmlessly into the bulk material at concentrations so low they do not affect product specifications, combustion characteristics (for coal) or downstream processing (for ore). The product reaches the customer at specification.
No moisture addition. Unlike water-only suppression, which adds significant moisture to the stockpile surface (and is absorbed into the bulk material, increasing shipping weight while reducing dry mass per tonne), polymer veneering applies minimal liquid volume. The surface is treated, not wetted. For commodities shipped to moisture specification (iron ore typically 8–9% moisture), this distinction directly protects the payable value per tonne.
Duration: weeks to months. A single Ore-Loc application provides protection for weeks to months depending on weather conditions and stockpile turnover. This compares to water-only suppression that lasts hours before evaporation returns the surface to its unprotected state. The reduction in water cart passes required across the stockyard is typically 80–90%.
Choosing the Right Product for Each Stockpile Type
Ore-Loc: Commodity Stockpiles Where Product Quality Matters
GRT: Ore-Loc is the primary product for iron ore, coal, mineral concentrate, bauxite, manganese and any stockpile where the treated material is the saleable product. The polymer is formulated to be compatible with commodity specifications — it does not introduce contaminants, does not affect assay results and does not interfere with downstream processing. For coal stockpiles, Ore-Loc also reduces surface oxidation by creating an oxygen-barrier layer, protecting both volume (less dust loss) and quality (less BTU degradation).
Soil-Loc: Broadscale Protection for Large Exposed Surfaces
GRT: Soil-Loc provides cost-effective broadscale wind erosion protection for stockpiles and surfaces where product quality specification is not the primary concern — ROM ore pads, waste rock dumps, inactive storage areas, quarry aggregate stockpiles and cleared land awaiting development. Applied as a diluted spray, Soil-Loc creates a surface crust that prevents wind erosion for months. It is the most cost-effective option for treating large surface areas where the material is either pre-processing (ROM) or non-product (waste rock, overburden).
Enviro-Binder: Long-Term Protection with Revegetation Support
GRT: Enviro-Binder is the product for stockpiles that will be stored for months or years and that benefit from vegetation establishment — primarily topsoil stockpiles and permanent waste rock dumps. Enviro-Binder provides erosion protection for up to 12 months and supports seed germination, enabling vegetation to establish on the stockpile surface as the permanent erosion control. For topsoil stockpiles, this is particularly valuable: the vegetation maintains the biological health of the stockpiled soil (microbial activity, seed viability, nutrient cycling) that will be needed for successful rehabilitation.
Application Methods: From Water Truck to Automated Gantry
Water truck with spray cannon. The most common application method for mine site stockpiles. The polymer is mixed into the water truck tank and applied using the truck’s spray cannon, which can reach stockpile surfaces at heights of 15–20+ metres from ground level. The truck drives around the stockpile perimeter, treating the exposed faces progressively. SMART Dosing Units at the fill point automate the mixing and record every application event.
Fixed spray bar or gantry system. For port terminals and processing plant stockyards with permanent stockpile configurations, fixed spray bars mounted on gantries above the stockpile can apply polymer automatically on a timed or trigger-based schedule. This eliminates the need for a dedicated water truck and operator, reducing the ongoing labour cost of the veneering programme.
Stacker-mounted application. Polymer can be applied to the stockpile surface during the stacking operation itself, treating each layer as it is placed. This is the most efficient application method for active stockpiles because it integrates veneering into the existing stacking workflow without a separate treatment pass.
Hand spray for targeted treatment. For small stockpiles, localised dust sources or areas that the water truck cannot reach, hand-pump or powered spray units provide targeted application. This is typical for quarry operations treating individual product stockpiles or for maintenance treatment of areas where the crust has been disturbed by loader operations.
Why Veneering Outperforms Water and Wind Fences as a Standalone Control
Water sprays: evaporate within hours in Pilbara or Bowen Basin conditions. Provide no residual protection. Add unwanted moisture to the product. Must run continuously during windy conditions, consuming water and operator time. Do not address rain erosion.
Wind fences: reduce wind speed by up to 70–80% in the sheltered zone (Aerison/DSI data). Effective within their footprint but do not protect the entire stockpile — wind from outside the protected arc still reaches exposed faces. They do not address rain erosion, loader disturbance or transfer-point dust. Capital cost for a 2 km wind fence system (as BHP installed at Port Hedland) runs into tens of millions of dollars.
Polymer veneering: protects the entire stockpile surface regardless of wind direction. Provides weeks to months of protection from a single application. Addresses both wind and rain erosion. Does not add moisture. Does not require permanent infrastructure. Can be applied to any stockpile configuration, any commodity and any scale — from a quarry’s 5,000 t crushed rock pile to a port terminal’s 500,000 t iron ore stockpile.
Wind fences and polymer veneering are complementary, not competing. The wind fence reduces the wind speed reaching the stockpile. The veneer protects the surface from whatever wind speed remains. Together they provide the highest level of protection. But for operations that cannot justify the capital cost of wind fence infrastructure, polymer veneering as a standalone control provides effective, affordable, immediate stockpile protection.
Frequently Asked Questions
Does stockpile veneering affect product quality or specifications?
No. GRT: Ore-Loc is formulated to be compatible with commodity specifications. The polymer crust is on the surface only and is broken during reclamation. The polymer disperses into the bulk material at concentrations too low to affect assay results, combustion characteristics (for coal) or downstream processing. The product reaches the customer at specification.
How long does stockpile veneering last?
A single Ore-Loc application provides protection for weeks to months depending on weather, wind exposure and whether the stockpile surface is disturbed by loader operations. Active stockpiles with daily loading and reclaiming require more frequent reapplication than static stockpiles awaiting dispatch. Soil-Loc and Enviro-Binder on topsoil and waste rock stockpiles can last 6–12 months.
How much product is lost from unprotected stockpiles?
Industry analysis documents product losses of 3–15% from wind erosion of unprotected stockpiles, with coal and coke having the highest propensity to emit dust among common mineral aggregates. Even at conservative loss estimates (0.1–0.5%), the revenue lost from a large-scale operation can reach millions of dollars annually. Polymer veneering costs a fraction of a cent per tonne treated, making the return on investment exceptionally high.
Can polymer veneering be applied to active stockpiles?
Yes. Ore-Loc is applied to the exposed surfaces of active stockpiles — the faces not currently being loaded or reclaimed. As the active face moves, the exposed faces are progressively treated. Stacker-mounted application can treat each layer during the stacking process itself. The veneer is designed to be broken during normal reclamation without affecting equipment or material flow.
Every Tonne on the Stockpile Should Leave on a Truck, Not on the Wind
A stockpile is stored product. It has been extracted, processed, transported and placed at significant cost. Every particle that leaves the stockpile on the wind is product that was paid for and never sold. Every gram of coal dust that deposits on a neighbouring property is a community complaint. Every PM10 reading that the boundary monitor registers from the stockyard is a contribution to the mine’s compliance position.
Polymer veneering protects all three outcomes simultaneously. GRT: Ore-Loc for commodity stockpiles where product quality matters. GRT: Soil-Loc for broadscale protection of ROM, waste rock and inactive surfaces. GRT: Enviro-Binder for long-term protection with revegetation on topsoil and permanent stockpiles. Applied by water truck, spray cannon, gantry or hand spray, documented through SMART Dosing telemetry.
For stockpile managers, environmental officers and processing plant managers responsible for the product between the crusher and the customer, the question is how much of that product is leaving on a truck versus leaving on the wind. Polymer veneering ensures the answer is: all of it on the truck.
Sources and References
WeatherSolve Structures: Wind Fences for Industrial Ports and Stockpiles — 3–15% product loss documented; 70% dust reduction from wind fencing
Australian Mining: Stockpile Dust Control — traditional water methods short-lived; polymer suppressants up to 12 months; environmental and operational benefits
Spray Grass Australia: Stockpile Dust Control Solutions — height/structure challenges, rain erosion contamination, ecosystem impact, nutrient loss from topsoil
GRT: GRT: Ore-Loc / Dust Suppression Products
GRT: GRT: Enviro-Binder
GRT: Dust Suppression Solutions — Soil-Loc
GRT: SMART Dosing Units
