Study guide
21.2 Philippine Air, Water, Waste & Hazardous-Substance Controls
PRC Mining Engineer Licensure Examination Philippines
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1 Chapter 1: Surface Mining Methods & Pit Optimization
1.1 Surface Mining Unit Operations & Method Selection 1.2 Bench Geometry, Slope Stability & Geotechnical Pit Design 1.3 Cut-Off Grade Optimization & Lerchs-Grossmann Pit Limits
2 Chapter 2: Underground Mining Methods & Strata Control
2.1 Underground Mining Method Classification & Selection 2.2 Rock Mechanics, Stress Analysis & Strata Control 2.3 Underground Ground Support Systems & Excavation Design
3 Chapter 3: Materials Handling, Equipment & Mine Economics
3.1 Drilling, Blasting & Explosives Engineering 3.2 Mine Loading, Haulage & Materials Handling Systems 3.3 Mine Capital (CAPEX), Operating Costs (OPEX) & Financial Evaluation
4 Chapter 4: Mine Safety, Ventilation & Philippine Mining Laws
4.1 Mine Ventilation Network Analysis & Environmental Quality 4.2 Philippine Mine Safety Rules, Health & Disaster Prevention 4.3 Philippine Mining Act of 1995 (RA 7942), DAO 2010-21 & Mining Ethics
5 Chapter 5: Physical Geology, Mineralogy & Philippine Deposit Types
5.1 Structural Geology, Tectonics & Ore Controls 5.2 Igneous, Metamorphic & Sedimentary Ore Mineralogy 5.3 Major Philippine Ore Deposit Models
6 Chapter 6: Mineral Exploration, Geophysics & Core Logging
6.1 Geochemical & Remote Sensing Exploration Techniques 6.2 Geophysical Exploration Methods in Mining Geology 6.3 Diamond Drilling, Core Logging & QA/QC Protocols
7 Chapter 7: Geostatistics, Resource Estimation & PMRC Code
7.1 Ore Body Block Modeling & Spatial Variography 7.2 Inverse Distance & Ordinary Kriging Grade Estimation 7.3 Philippine Mineral Reporting Code (PMRC 2020) & Resource Classification
8 Chapter 8: Comminution, Sizing & Physical Mineral Separation
8.1 Crushing, Grinding & Bond Work Index Calculations 8.2 Particle Screening, Hydrocyclone Classification & Sizing 8.3 Gravity Concentration & Magnetic/Electrostatic Separation
9 Chapter 9: Froth Flotation & Extractive Hydrometallurgy
9.1 Froth Flotation Chemistry, Reagents & Cell Kinetics 9.2 Leaching Technologies (Heap, Agitation & Tank) 9.3 Precious Metal Recovery: CIP, CIL, Merrill-Crowe & Electrowinning
10 Chapter 10: Process Plant Flowsheets & Environmental Tailings Management
10.1 Metallurgical Plant Flowsheets & Pulp Mass Balances 10.2 Tailings Storage Facility (TSF) Design & Dam Safety 10.3 Acid Mine Drainage (AMD) Mitigation & Environmental Protection (EPEP/FMR/DP)
11 Chapter 11: 2025 PRC Blueprint, Prospecting Tools & Exploration Decisions
11.1 Official 2025 TOS, Three-Paper Structure & Exam Strategy 11.2 Prospecting Instruments, Base Maps & Surface Geological Mapping 11.3 Integrating Direct and Indirect Evidence for Exploration Decisions
12 Chapter 12: Mine Infrastructure, Sustainable Development & Climate
12.1 Power, Water, Drainage & Support-Facility Selection 12.2 Sustainable Development, Progressive Rehabilitation & Community Impact 12.3 Mining, Climate, Reforestation, Coal & Energy-Transition Minerals
13 Chapter 13: Mine Valuation, Financial Analysis & Due Diligence
13.1 Time Value of Money, Future Value & Present Value 13.2 Financial Statements, Mine Economics & External Price Drivers 13.3 Exploration Provenance, Technical Review & Legal Due Diligence
14 Chapter 14: Mine Organization, Communication & Accountable Leadership
14.1 Line and Staff Functions in a Mining Organization 14.2 Communication With Superiors, Peers & Subordinates 14.3 Authority, Responsibility, Delegation & Safety Accountability
15 Chapter 15: Philippine Mining Law, Indigenous Rights & Professional Ethics
15.1 Legal Hierarchy, Mineral Tenure & Compliance Analysis 15.2 Constitutional Participation, IPRA, FPIC & Ancestral Domains 15.3 RA 4274, Professional Scope, Ethics & Document Integrity
16 Chapter 16: Applied Mathematics & Mine Surveying
16.1 Engineering Mathematics for Safe, Efficient Mine Decisions 16.2 Survey Control, Instruments, Traverses & Error Adjustment 16.3 Topographic Maps, Underground Set-Out & Survey Timeliness
17 Chapter 17: Feasibility Studies, Data Quality & Project Decisions
17.1 Scoping, Pre-Feasibility & Final Feasibility Study Maturity 17.2 Data Accuracy, Assumption Control & Go/No-Go Decisions 17.3 Multidisciplinary Integration, Interfaces & Independent Review
18 Chapter 18: Mining Computer Applications, Digital Control & Global Developments
18.1 Computer Functions, Office Applications & Data Governance 18.2 Geological Modeling, Mine Planning, Scheduling & Valuation Software 18.3 Real-Time Control, Critical Minerals & Regional Mining Developments
19 Chapter 19: Earth Systems, Geologic Time & Philippine Hazards
19.1 Solar-System Origin, Earth Interior & Atmospheric Layers 19.2 Rock Cycle, Landforms & the Geologic Time Scale 19.3 Philippine Tectonics, Geologic Hazards & Mitigation
20 Chapter 20: Metallurgy, Foundry Practice & Assaying
20.1 Extractive, Physical & Adaptive Metallurgy Principles 20.2 Foundry Materials, Casting, Solidification & Defects 20.3 Sampling, Fire Assay, Cupellation, Parting & Assay Calculations
21 Chapter 21: Solid–Liquid Separation, Environmental Law & Mine Ecology
21.1 Thickening, Filtration & Solid–Liquid Separation 21.2 Philippine Air, Water, Waste & Hazardous-Substance Controls 21.3 Mine Ecology, Closure, Tailings, Waste & Community Livelihood
21.2 Philippine Air, Water, Waste & Hazardous-Substance Controls
Key Takeaways Explain This Topic AI
Mining environmental compliance is multi-law: RA 7942 and DAO 2010-21 operate alongside the EIS system and laws on clean air, clean water, ecological solid waste, and toxic substances and hazardous wastes.
PD 1586 establishes the Philippine Environmental Impact Statement System; an Environmental Compliance Certificate contains project-specific conditions and does not replace other permits.
RA 8749 governs air-pollution control, RA 9275 water-quality and discharge control, RA 9003 ecological solid-waste management, and RA 6969 toxic substances and hazardous or nuclear wastes.
A compliance register maps each source, pathway and material to the current standard, permit, monitoring point, method, frequency, responsible person, trigger and evidence.
Pollution prevention follows avoid and reduce at source, segregate, contain, reuse or recover, treat, monitor, and dispose through authorized systems.
Last updated: August 2026
A mine is not compliant merely because it holds a mineral agreement. Mineral, environmental, water, air, waste, hazardous-material, safety, local and project-specific approvals overlap. Candidates should identify the controlling law and then verify the current implementing rule, standard, permit and Environmental Compliance Certificate (ECC) condition. Numerical limits can change and vary by source or receiving classification; never invent one generic mine limit.
Environmental Impact Assessment
Presidential Decree No. 1586 established the Philippine Environmental Impact Statement System. Covered projects undergo the applicable environmental assessment and, when approved, receive an ECC with conditions. The ECC records commitments and conditions; it is not a permit to violate clean-air, clean-water, hazardous-waste, protected-area, Indigenous-rights, local or mining rules. A major project change may require screening or amendment under current procedures.
Clean Air
Republic Act No. 8749 , the Philippine Clean Air Act of 1999, provides the air-quality and emission-control framework. Mine sources include crushing and transfer dust, roads, blasting, generators, dryers, furnaces, smelters, stockpiles and wind erosion.
Use the hierarchy:
- eliminate unnecessary handling and drop height;
- enclose, capture and ventilate;
- apply water or compatible suppressant;
- pave, grade or stabilize roads and manage speed;
- maintain engines and combustion;
- use collectors, scrubbers or process controls; and
monitor source and ambient effects as required.
Water sprays can create runoff or process problems, so integrate water balance. An ambient station placed upwind cannot demonstrate downwind community exposure.
Clean Water
Republic Act No. 9275 , the Philippine Clean Water Act of 2004, addresses water-quality management and discharge. Mining pathways include pit and underground water, process effluent, contact runoff, seepage, domestic wastewater, sediment, acid drainage, metals, reagents and spills.
Separate clean and contact water, minimize generation, contain and recycle, treat according to chemistry, and discharge only under applicable permission and standards. A compliant point sample does not prove long-term performance if flow, storm conditions or pollutant load are ignored. Monitor upstream/background, source, compliance point and downstream receptor where required.
Solid Waste
Republic Act No. 9003 , the Ecological Solid Waste Management Act of 2000, provides the framework for municipal-type solid waste segregation, collection, recovery and disposal. Camps and offices generate food, paper, plastics and residual waste. Mine waste rock and tailings have specialized mining and environmental controls and should not be casually classified as ordinary municipal waste. Segregate at source and prevent open dumping and burning.
Toxic Substances and Hazardous Wastes
Republic Act No. 6969 governs toxic substances and hazardous and nuclear wastes. Mine operations may manage used oil, solvents, contaminated containers, laboratory chemicals, batteries, cyanide-related materials, mercury-containing equipment, reagents and treatment sludge. Current DENR rules determine registration, generator identification, storage, labeling, manifesting, transport, treatment and disposal.
A hazardous-waste area needs compatible segregation, secondary containment, weather protection, labels, inventory, inspection, spill equipment, fire control and authorized removal. Never mix wastes merely to reduce container count; incompatible reactions can generate heat, gas or fire.
Compliance Register
For each source or material record:
Field Example question
Source/pathway Where can pollutant originate and travel?
Legal basis Which law, current rule and permit apply?
Parameter/limit What exact condition and averaging period?
Location/method Where and how is it measured?
Frequency Routine, event-based, continuous?
QA/QC Calibration, blank, duplicate, chain, laboratory?
Owner/action Who reviews and what threshold triggers action?
Evidence Record, result, receipt, inspection, submission?
Monitoring Quality
A result needs representative location, time, flow or operating context, correct preservation, holding time, chain of custody, calibrated field instrument, qualified laboratory and review. A nondetect has a method detection limit; it is not necessarily zero. Trend charts should show rainfall, flow, production and treatment condition where relevant.
Incident Response
Stop the source if safe, protect people, contain spread, notify internal and external authorities according to current requirements, characterize material, recover and remediate, investigate cause, document waste disposition, verify cleanup and update controls. Do not delay required notification until every fact is known.
Exam Trap
An ECC, discharge permit, hazardous-waste registration and mineral agreement perform different functions. Select the response that identifies the specific pathway and applicable control rather than claiming one approval covers all environmental duties.
Verify the Current Numeric Requirement
For any legal limit, record the issuing authority, instrument and section, effective date, parameter, averaging period, sampling point, analytical method, reporting limit and permit-specific condition. Compare the most stringent applicable requirement without mixing ambient criteria, effluent limits and workplace exposure values. A copied number with no matrix, location or averaging basis is not a usable compliance standard, even when its units look familiar.