Coal Mines Industry Terminology

AMD at the outfall exceeded permit limits, so we added limestone dosing; The waste rock with high pyrite was isolated to reduce AMD; The closure plan budgets O&M for AMD passive treatment systems.

Install a 600 mm duct and jet fan to ventilate the development heading; Auxiliary ventilation will push fresh air past the brattice to the face; The audit found damaged ducts limiting auxiliary ventilation effectiveness.

The new belt conveyor is rated at 3,000 tph to the silo; We scheduled a splice on the No. 3 belt during the maintenance window; Carryback on the return belt increased cleanup time.

Respiratory surveillance detected early CWP in two workers; Tightening dust limits aims to reduce black lung incidence; Better water sprays on the miner reduced respirable dust at the face.

The CHPP upgrade increased yield by 2%; Flotation recovery of fines improved after reagent optimization; The plant was constrained by the dewatering centrifuges.

The No. 3 coal seam averages 2.2 meters thick; Seam splitting complicates the panel layout; Gas content in the seam requires pre-drainage before mining.

The continuous miner averaged 1,200 tonnes per shift; Remote operation improved safety at the face; Cutter head pick wear increased in the stone band.

The dragline advanced the cut by 30 meters this week; Cast blasting reduced dragline cycle times; Boom inspections found two cracked lacing members.

High-pressure sprays reduced dust on the transfer point; We applied a surfactant to improve haul road dust control; Fogging cannons cut dust during stockpile reclaim.

The mine’s EBITDA margin improved with lower strip ratio; Lenders required a minimum EBITDA-to-interest coverage; Guidance raised full-year EBITDA on higher coal prices.

We installed additional roof support near the face; Gas at the face spiked after the cut-through; A belt move was scheduled to keep up with face advance.

Column flotation boosted fine coal recovery; Frother dosage was reduced to stabilize the froth; The flotation tails ash rose after a feed change.

The contract specifies 6,000 kcal/kg GAR; Converting GCV to NCV affects plant heat-rate calculations; Blending lifted average GCV by 150 kcal/kg.

CO in the goaf indicated early-stage heating; Goaf seals were reinforced before retreat; Subsidence predictions depend on goaf compaction.

A highwall miner recovered coal under the old highwall; Prism monitoring flagged highwall movement after rain; Scaling removed loose blocks from the highwall bench.

HSE performance improved with a new risk register; The board reviewed HSE lagging and leading indicators; Contractor onboarding now includes HSE competency checks.

Drilling upgraded part of the Inferred to Indicated Resource; The scoping study relies on Indicated tonnage; More core is needed to convert to Measured.

Nitrogen inertisation lowered O2 in the goaf below 8%; A GAG unit was mobilized to inertize the heating panel; Inertisation was maintained during longwall moves.

The IPO prospectus follows the 2012 JORC Code; A Competent Person signed off the reserve statement; JORC Table 1 disclosures were included as an appendix.

The benchmark 5,500 kcal/kg NAR index moved higher; Labs reported 6,300 kcal/kg GCV (adb); The buyer requested conversion from kcal/kg to MJ/kg.

The LOM plan shows 12 years at 4 Mtpa; Rehabilitation cash flows were included in the LOM model; Stripping ramps up in the first three LOM years.

Retreat longwall increased productivity to 10 ktpd; Shield pressure was adjusted to control roof weighting; A new AFC drive boosted longwall availability.

In-seam pre-drainage wells lowered gas content to 6 m3/t; Cross-measure holes were drilled into the goaf; Captured methane was used for power generation onsite.

Total moisture rose after rain on the ROM stockpile; Inherent moisture is used for adb basis reporting; Higher moisture reduced boiler efficiency at the plant.

MSHA cited the operation for inadequate escapeway signage; The mine complied with MSHA’s new silica standard; Annual refresher training met MSHA Part 48 requirements.

The CHPP nameplate is 10 Mtpa; The rail loadout runs at 4,000 tph at nameplate; Nameplate capacity was de-bottlenecked with a larger pump.

NPV improved after lowering the strip ratio; Sensitivity analysis showed NPV depends on the price deck; A 10% discount rate was applied to compute NPV.

The open-cut moved 20 Mbcm of overburden last year; Cast blasting improved dig rates in the next cut; Traffic management was revised for the new ramp.

Wet weather slowed overburden removal; The dragline cast most overburden directly into the spoil; Overburden with pyrite was encapsulated to limit AMD.

PCI demand rose with steel output; The blend targets 7% ash PCI coal; HGI tests confirmed grindability for PCI specs.

Pillar design increased width under the river; Yield pillars were modeled to manage abutment loads; Rib spalling was observed on undersized pillars.

We awarded the pre-strip contract for Stage 2; Pre-strip volumes peaked in Q3 to build coal inventory; Rain slowed pre-strip progress on the east pit.

The customer tightened chloride in the quality specs; Penalties apply if ash exceeds spec; Online analyzers help maintain quality specifications in real time.

Progressive reclamation reduced final closure liability; Topsoil was respread and seeded on the north spoil; Stream reconstruction is part of the reclamation plan.

Personal dust monitors showed elevated respirable dust at the face; Silica controls were tightened in development headings; Booth filtration reduced respirable dust exposure for operators.

ROM stockpile moisture increased after storms; The shovel selectively mined low-ash ROM for blending; ROM bypass was curtailed due to off-spec ash.

Shield pressure was raised to manage roof weighting; A leaking hose took one shield out of service; Shield advance was sequenced during the shearer pass.

Rising CO indicated spontaneous combustion in the panel; The stockpile was compacted and turned to break hotspots; Nitrogen injection suppressed a suspected heating.

Lower strip ratio improved unit costs; Pre-strip was increased to maintain strip ratio; The pit optimization minimized high strip ratio blocks.

The subsidence survey confirmed the predicted trough; A pipeline was protected with a subsidence management plan; Building impact assessments were completed along the panel.

The tailgate convergence increased near the setup room; We installed additional roof bolts in the tailgate; Escape capsules were positioned in the tailgate entry.

The utility purchased 5,500 kcal/kg NAR thermal coal; Thermal coal prices tracked API indices; Blending met the thermal coal ash and sulfur specs.

The operation transitions from open-cut to underground; Ventilation upgrades supported the new panel; Underground logistics were streamlined with larger battery scoops.

VIU modeling favored lower-ash coal despite higher price; Chlorine penalties reduced VIU for this cargo; Boiler tests refined the VIU assumptions.

The main fan duty increased after the new panel started; Regulators were adjusted to balance ventilation splits; Modeling showed a short circuit in the ventilation network.

Washability curves suggest a 1.55 RD cut-point; High near-gravity material reduced separation efficiency; The seam’s washability supports a low-ash product.

A windblast occurred after the longwall breakthrough; Barriers and retraction procedures mitigate windblast risk; The risk assessment flagged windblast potential near the fault.

XRF confirmed low sulfur in the product; Online XRF tracked ash chemistry for boiler slagging control; The lab upgraded to a new XRF spectrometer.

Plant yield improved after cyclone upgrades; Low-density cut points increased yield but raised ash; Daily yield reporting supports blending decisions.

The site’s vision is Zero Harm to people and environment; Some critics argue Zero Harm can stifle reporting; Zero Harm initiatives focused on critical risk controls.