Thông tư 35/2025/TT-BNNMT quy định nội dung điều tra cơ bản địa chất, điều tra địa chất về khoáng sản do Bộ trưởng Bộ Nông nghiệp và Môi trường ban hành

CIRCULAR

 ELABORATING GEOLOGICAL RECONNAISSANCE, GEOLOGICAL SURVEY FOR MINERALS

Pursuant to the Law on Geology and Minerals No. 54/2024/QH15 dated November 29, 2024;

Pursuant to Government’s Decree No. 193/2025/ND-CP dated July 02, 2025 elaborating the Law on Geology and Minerals;

Pursuant to Decree No. 35/2025/ND-CP dated February 25, 2025 defining the functions, tasks, powers and organizational structure of the Ministry of Agriculture and Environment of Vietnam;

At the request of the Director of the Department of Geology and Mineral Resources of Vietnam;

The Minister of Agriculture and Environment promulgates a Circular elaborating geological reconnaissance, geological survey for minerals.

Chapter I

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Article 1. Scope

This Circular prescribes geological reconnaissance for the preparation of a national geological map of up to 1:50.000 scale and field-specific maps of exceeding 1:50.000 scale; geological survey for minerals;

Article 2. Regulated entities

This Decree applies to regulatory bodies engaged in geology and minerals; organizations and individuals engaged in schemes of geological reconnaissance and geological survey for minerals

Chapter II

GEOLOGICAL RECONNAISSANCE FOR THE PREPARATION OF A NATIONAL GEOLOGICAL MAP AND FIELD-SPECIFIC MAPS OF EXCEEDING 1:50.000 SCALES

Section 1. NATIONAL GEOLOGICAL MAP PREPARATION

Article 3. Geological map at a scale of 1:1.000.000

1. Consolidate, analyze, and process geological and mineral documents up to a scale of 1:500,000, including information on geology, geological resources, and regional and continental-scale minerals.

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3. Supplement geological information, geological and mineral resources; link, connect geological units, tectonic units at regional and continental scales.

4. Edit, prepare geological maps showing geological factors and structures; geological and mineral resources meeting international integration requirements.

Article 4. Geological map at a scale of 1:500.000

1. Consolidate, analyze, and process geological and mineral documents up to a scale of 1:500,000, including information on geology, geological resources, and regional and territory-scale minerals.

2. Compile, edit, and represent sedimentary formations, metamorphism, magmas of different ages and compositions; distribution of geological resources and minerals.

3. Supplement geological information, geological and mineral resources; link, connect geological units, tectonic units at regional and territorial scales.

4. Consolidate geological and mineral data to clarify the geological structure, the geological development history of the research area; determine the relationship between geological resources minerals with lithological assemblages or a combination of geological structural elements present in the mapped area.

5. Edit, prepare geological maps consisting of geological, structural, and mineral elements meeting international integration requirements.

Article 5. Geological map at a scale of 1:250.000

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2. Consolidate, edit, and detail the geological structures, distribution and boundaries of various geological resources and minerals from geological reconnaissance and geological surveys at larger scales.

3. Supplement geological and mineral information; link, connect geological units, geological structures at regional scales.

4. Zone for predicting the prospects of geological and mineral resources; prepare geotechnical zoning map for predicting geological and mineral resources at the same scale.

5. Edit, prepare geological maps showing geological and structural elements; geological and mineral resources, meeting international integration requirements.

Article 6. Geological and mineral map at a scale of 1:50,000 of mainland

1. Geological and mineral maps at a scale of 1:50,000 shall be prepared according to specialized fields: mapping of geological formations, metamorphism, unstratified volcanoes, intrusive magmas, structures – formations, minerals, landforms, tectonic shells, geological hazards, environmental geology, hydrogeology, engineering geology, geological sites, geological heritage.

2. Divide geological units according to material composition, age of formation, and genesis conditions; identify lithological and geological characteristics, components, distribution and relationships on the map.

3. Discover, preliminarily investigate various types of minerals; determine premises, signs, laws of mineral distribution; predict prospective mineral areas; clarify the relationship between minerals and geological formations and structural geological elements; identify controlling factors for mineral distribution and favorable geological conditions for mineral accumulation; delineate areas with potential for new mineral discoveries or resource increases in known mining areas

4. Investigate the current situation, delineate areas where geological hazards may occur; geological factors, geological anomalies, gravimetry, geophysics, areas containing hazardous minerals; areas with prospects for geological resources and minerals.

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1. Geophysical maps at scales of 1:1,000,000; 1:250,000; 1:50,000, including: gravity maps, magnetic anomaly maps, radiological maps.

2. Gravity maps

a) Iso-value gravity map based on ground and airborne gravity data; determine gravity values for each geological entity;

b) Consolidate and analyze gravity field values from the 1:1,000,000 scale gravity map to establish a tectonic zoning map of the Earth's crust, predict mineralization;

c) Consolidate and analyze gravity field values from the 1:250,000 scale gravity map to establish a structural tectonic map, clearly showing fault systems, intrusive bodies, volcanic formations, sedimentary formations, and prospects for geological resources and minerals.

3. Magnetic anomaly maps

a) Iso-value magnetic map based on airborne magnetic data, determine magnetic values of geological entities;

b) Consolidate and analyze magnetic field values from the 1:1,000,000 scale magnetic anomaly map to establish a geological map and predict mineralization;

c)  Consolidate and analyze magnetic field values from the 1:250,000 scale magnetic anomaly map to establish a geological map, specify geological boundaries, structural controls on ore deposits, location, size, and shape of mineralized zones;

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4. Radiological maps

a) Radiological map at scales from 1:1,000,000 to 1:500,000 serving small-scale geological mapping and mineral exploration;

b) Radiological map at scales from 1:250,000 to 1:100,000 serving medium-scale geological mapping and mineral exploration;

c) Radiological map at scales of 1:50,000 and larger serving the assessment of the potential of radioactive ore and other useful minerals.

Article 3. Geochemical map at a scale of 1:250.000

1. Determine geochemical background, geochemical anomalies, contrast of geochemical anomalies, and characteristics of elemental geochemistry.

2. Delineate, predict areas with hidden mineral potential, areas which may be environmentally affected and soil fertility characteristics based on geochemical data.

3. Delineate, predict the environmental impact related to the accumulation of hazardous elements.

4. Determine the material composition, environmental geochemical indices, soil pH, and nutrients to evaluate soil quality and classify soil.

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1. Collect relevant geological and socio-economic documents.

2. Consolidate and analyze geological data to delineate areas with prerequisites and signs of geological interest sites,

3. Consolidate, analyze, and evaluate the areas identified as geological interest sites, with potential to become geological heritage sites (if any).

4. Maps of geological interest sites, geological heritage sites at a scale of 1:250,000 shall delineate recognized geological park areas, geological heritage sites; current status of investigation; identified geological interest sites, areas with potential to become geological heritage sites.

5. Establish a digital database on geological interest sites, geological heritage sites.

Article 10. Geomorphologic map at a scale of 1:50.000

1. Divide, describe landforms according to origin and age, geomorphic factors (cliffs, watersheds, water collection lines, erosion channels, etc.), manifestations of recent tectonic activity, modern tectonics, and active faults.

2. Determine the endogenic and exogenic geological conditions as the causes of landform formation, geomorphic factors.

3. Identify landforms with potential for mineral accumulation and destruction; landforms prone to geological hazards.

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5. Represent on the map landforms, active faults, mineral accumulation and destruction, areas prone to geological hazards related to landform types.

6. Identify areas with landscape potential to become geological heritage sites of geomorphic type.

7. Evaluate the significance and value of various landforms.

Article 11. Weathering crust map at a scale of 1:50.000

1. Divide the types of weathering crust based on lithology, geochemistry, minerals, age of weathering crust; clarify the characteristics of the layers from top to bottom based on lithological and mineral features (composition, color, structure...) with different characteristics and oxygen levels.

2. Determine the formation conditions of weathering crust based on parent rock, topography, geomorphology, climate, vegetation cover, and time.

3. Identify the relationship and prospects of exogenous minerals, environmental geology, geological hazards, and engineering geology.

Article 12. Geological hazard map at a scale of 1:50.000

1. Compile, analyze phenomena, signs, prerequisites, and manifestations of geological hazards; related natural, economic, and socio-economic conditions.

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3. Delineate areas at risk of geological hazards; propose preventive measures to minimize damages.

Article 13. Environmental geology map at a scale of 1:50.000

1. Compile and consolidate documents related to geology and minerals affecting the environment; economic-social conditions, epidemiology.

2. Determine the changes in the geological environment, partition geological environmental pollution; causes, and extent of impact on the living environment.

3. Predict the  spread of harmful elements in the soil and water environments.

Article 14. Engineering geological map at a scale of 1:50.000

1. Collect, compile, analyze data on climate, meteorology, surface water, groundwater, terrain, landforms, dynamic geological phenomena.

2. Determine the physical properties of geological entities by age and origin of formation; identify dynamic hydrogeological characteristics, the relationship between geology, hydrology, and engineering structures.

3. Conduct zoning of engineering geology, specify areas of engineering geology, and provide guidelines on sustainable and effective use.

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1. Assess the physical and chemical characteristics of geological entities, features of engineering geology, hydrogeology, environmental geology, geological hazards; the interaction between the urban system and the geological environment.

2. Determine the compatibility between geological space and urban development processes, urban planning, geological resources.

3. Delineate areas for urban geological space development, forecast anthropogenic impacts on the urban geological environment.

Section 2. FIELD-SPECIFIC MAPS OF EXCEEDING 1:50.000 SCALE

Article 16. Field-specific maps

1. Field-specific maps are prepared to serve the state management of geology, minerals, scientific research, including: remote sensing; geology; geophysics; geochemistry, gravimetry; sample analysis; application of GIS technology, modeling, and digital database.

2. Based on the research objectives and practical applications, field-specific maps shall be classified as follows:

a) Structural geological map at a scale of 1:25,000;

b) Lithological-structural map at scales of 1:25,000 or 1:10,000;

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d) Map of predictive deep-seated geological and mineral resources at scales of 1:25,000 or 1:10,000;

dd) Ore deposit structure map at scales of 1:10,000, 1:5,000;

e) Magma rock lithological map at scales of 1:25,000 or 1:10,000;

g) Geochemical and weathering crust map at a scale of 1:25,000;

h) Geophysical, geochemical, modern sedimentary and paleogeographic map at a scale of 1:25,000, 1:10,000, or 1:5,000.

Article 17. Consolidated geological resources and mineral maps

1. Consolidate, analyze the results of geological reconnaissance, geological surveys for minerals, exploration and exploitation of minerals to serve state management of geology and minerals by sectors and areas.

2. According to management requirements, the consolidated geological resources and mineral map shall be classified as follows:

a) Map of survey and evaluation of geological and mineral resources, mineral exploration and exploitation at a scale of 1:25,000;

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c) Consolidated map of national mineral reserves, mineral planning, and related planning at a scale of 1:25,000 or 1:10,000.

Chapter III

GEOLOGICAL SURVEY CONTENTS FOR MINERALS

Article 18. Surveys of geological structures with prerequisites and favorable indications for minerals

1. Identify geological factors and favorable geological structures for mineral formation and accumulation.

2. Evaluate geological entities with mineralization potential.

3. Delineate areas and assess the potential of primary minerals, secondary minerals, and hidden or overlaid minerals.

4. Forecast primary mineral resources up to Resources 334a.

5. Prepare a mineral geological map at a scale of 1:25,000; delineate areas with potential for mineral potential evaluation.

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1. Collect and consolidate geological, geophysical, and geochemical documents to prepare a mineral geological map at a scale of 1:10,000 to 1:5,000 or larger depending on the complexity and size of geological and mineral objects.

Collect and consolidate geological, geophysical, and geochemical documents to prepare a mineral geological map at a scale of 1:10,000 to 1:5,000 or larger depending on the complexity and size of geological and mineral objects to be represented.

2. Determine geological factors affecting the formation, accumulation, and alteration of ore bodies; identify mineral distribution patterns; predict hidden or overlaid ore bodies.

3. Preliminary evaluation of mineral prospective and hydrogeological, engineering geological conditions for mineral exploitation.

4. Forecast primary mineral resources up to the 333 resources; delineate areas with potential for mineral exploration and exploitation.

Chapter IV

IMPLEMENTATION CLAUSES

Article 20. Effect

1. This Circular shall come into force from the day on which it is signed.

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1. Chief of the Ministry Offices, heads of authorities, organizations, and individuals specified in Article 2 shall implement this Circular.

2. Any difficulties that arise during the implementation should be promptly reported to the Ministry of Agriculture and Environment for consideration and handling./.

PP. MINISTER
DEPUTY MINISTER




Tran Quy Kien