Mine Ventilation and Planning Parameters Flashcards

Vocabulary flashcards detailing key parameters, formulas, air velocities, gas standards, and tonnage calculations from mine ventilation planning notes.

Air Factor

A ventilation planning parameter defined as the mass flow rate of air required per thousand tons of rock mined per month, typically given as $4.0\,\text{kg/s/kton/month}$ or within a range of $3.0\text{--}6.0\,\text{kg/s/kton/month}$.

Mean Rock Breaking Depth (MRBD)

The depth parameter in mine ventilation design associated with required air factors ranging between $3.0\,\text{kg/s/kton/month}$ and $6.0\,\text{kg/s/kton/month}$.

Diesel Factor

The required airflow allowance per unit of diesel power in mechanised mining, equal to $0.12\,\text{m}^3\text{/s/kW}$ of rated engine power (or $0.06\,\text{m}^3\text{/s/kW}$ under new low-sulfur diesel regulations).

Diesel Engine Heat Generation Rate

The heat produced by diesel machinery, specified as $3.2\,\text{kW/kW}$ rated engine power at peak power and $2.0\,\text{kW/kW}$ rated engine power on average (approximately $2000\,\text{kW}$ at $100\%$ utilization).

Shaft Outbye Leakage Allowance

The planned ventilation leakage in shaft outbyes, specified as up to $5\%$ of the main upcast or east fan airflow ($Q$).

Virgin Rock Temperature (VRT)

The natural temperature of unmined rock at a given depth, calculated using the equation $\text{VRT} = \text{SRT} + \text{GeoTG} \times \text{Depth}$, where $\text{SRT}$ is Surface Rock Temperature and $\text{GeoTG}$ is Geothermal Gradient.

Refrigeration Requirement Formula

The formula used to calculate total cooling plant capacity in kW, given by $\text{Refrig. req. (kW)} = \text{Total Heat Load} + \text{Heat Added by Air}$ or $\text{Total Heat Load} - \text{Cooling Capacity of Air}$.

Air Velocity in Unequipped Shafts

The recommended airflow velocity range for unequipped downcast or upcast shafts, specified between $18\,\text{m/s}$ and $22.5\,\text{m/s}$.

Air Velocity in Equipped Shafts

The recommended airflow velocity range for equipped downcast shafts containing buntons and cages, specified between $10\,\text{m/s}$ and $15\,\text{m/s}$.

Air Velocity in Return Airways (RAWs)

The target velocity in return airways set at $10\,\text{m/s}$ to effectively transport dust and diesel fumes out of the mine to the surface.

Air Velocity in Intake Airways (IAWs)

The target airflow speed maintained in intake airways, designated as $7\,\text{m/s}$.

Stoping Face Air Velocity

The required airflow speed maintained across an active stoping face, specified between $0.25\,\text{m/s}$ and $2.0\,\text{m/s}$.

Development Face Delivery Quantity (Normal Blast)

The required ventilation delivery rate for development faces during normal blasting operations, equal to $10.2\,\text{m}^3\text{/s/m}^2$ of face area.

Multi-blast Re-entry Period

The minimum mandatory waiting time of $30\,\text{minutes}$ following a multi-blast operation, during which the forcing airflow quantity is doubled ($2 \times$ force quantity).

Positional Efficiency of Refrigeration Plant

The assumed operational efficiency factor for underground refrigeration plant positioning, taken as $80\%$ to account for line, friction, and water losses.

Surface Bulk Air Cooler (BAC) Design Temperatures

Standard intake air temperatures used for planning: $10^\circ\text{C}$ if surface pre-cooling is utilized, or $18^\circ\text{C}$ if no pre-cooling is applied.

Mine Gas Threshold Limits

Maximum allowable underground gas concentrations: $5\,\text{ppm}$ for $\text{NO}_x$, $100\,\text{ppm}$ (or standard $30\,\text{ppm}$) for $\text{CO}$, and $5000\,\text{ppm}$ to $10000\,\text{ppm}$ ($1\%$) for $\text{CO}_2$.

Fissure Water Heat Load

The thermal heat transferred to mine air by underground fissure water, calculated as $q = M_w \times C_p \times \Delta T$, where $\Delta T$ is the temperature difference between fissure water and the design reject temperature.

Stope Tonnage Formula

The mathematical formula to determine mined tonnage in stopes: $\text{Stope Tonnage} = \text{Face Length (FL)} \times \text{Stope Height (SW)} \times \text{Advance (FA)} \times \text{Rock Density}$.

Shaft Tonnage Formula

The mathematical formula to determine excavated shaft tonnage: $\text{Shaft Tonnage} = \left(\frac{\pi d^2}{4}\right) \times \text{Advance (FA)} \times \text{Rock Density}$.