Mining Lease Boundary Survey with DGPS

Why does a mining lease boundary survey need DGPS?

Each boundary pillar needs a coordinate that the state, the Indian Bureau of Mines and a neighbouring lessee can all check. Only survey-grade GNSS gives that repeatably over a large area. Hand-held GPS can be several metres out, the difference between mining your own mineral and someone else's. Differential global positioning system (DGPS) work removes most of that error by comparing the rover with a base station on a known point.

Coordinates also tie the lease to the rest of the mining plan. The surface plan, cadastral overlay, safety zones and annual progress drawings all hang on the same pillars and inherit any error in them.

What do mining plan reviewers ask for?

Consistent, coordinated boundary data shown the same way on every plate. Indian Bureau of Mines scrutiny comments on submitted mining plans repeatedly ask for:

• Coordinates of all lease boundary pillars in latitude and longitude (degrees, minutes, seconds) on WGS-84.
• The lease boundary on the cadastral map, with khasra or survey numbers and pillar coordinates.
• A surface plan on a UTM grid showing boundary, pillars and ground control points, with values tabled.
• The 7.5 m safety zone along the boundary marked, with other statutory zones near roads, nalas, villages and power lines.
• Identical pillars and surface features on all plans and sections.

The exact requirement comes from the Mineral Conservation and Development Rules, 2017 and state conditions, as interpreted by your Qualified Person. We make the measurements sound and present them as reviewers expect.

How is the boundary surveyed in the field?

Control first, pillars second, features third, and every step checked twice.

1. Control network: at least two control points on stable ground are observed in static sessions, tied where possible to a national reference station.
2. Existing pillars: each pillar on the lease sketch is located and observed by RTK; missing or disturbed ones are noted, not quietly replaced.
3. Comparison: observed positions are compared with the state-certified lease sketch, and every difference is listed.
4. Re-establishment: where the competent authority directs, pillars are set out at certified coordinates.
5. Surface features: roads, nalas, power lines, houses, wells and working edges are picked for the safety zones.
6. Topography: by total station or drone survey, depending on area and active workings.

Where a pillar is disputed with a neighbouring lease or landholder, the work follows any boundary survey. It helps to know how land demarcation proceeds with land records beside the lease papers.

What if the pillars on the ground disagree with the lease sketch?

The difference is reported plainly, with size and direction, and the lessee, QP and authority decide what to do. Disagreements are common on older leases, where pillars fixed by plane table or compass decades ago were converted to coordinates later. Some have also been knocked over or moved during road work.

Three patterns recur. If every pillar is shifted by about the same amount in one direction, a datum or conversion issue in the certified coordinates is likely. If one or two pillars are out while the rest agree, local disturbance is the cause. Scattered differences call for careful comparison with the cadastral map before any conclusion.

Our comparison sheet groups the differences so the pattern shows at a glance, keeping talks with the mining department short and factual.

When does a drone help on a lease?

When the lease is large, the terrain broken or the workings fast-changing. Drone mapping with our two RTK drones produces an orthomosaic and surface model of the whole lease in a day or two, controlled by ground points. The surface plan then shows a current picture of pits, benches, dumps and haul roads. The drone LiDAR payload models ground under scrub, which helps in forested country.

Repeat flights at intervals show how the pit has advanced, and the same control network keeps successive surveys comparable. For volumes, the processed surfaces and contour lines can be differenced between dates.

What about services under haul roads and plant areas?

Mines often have more buried services than people assume: power cables to crushers and pumps, water lines, and sometimes third-party pipelines crossing the lease. Before trenching or blasting near them, use the guidance in details on Call Before You Dig in India and ask us to scan the area. For record drawings of plant, crushers and structures once built, ask our as built survey team, who work from the same control.

Deliverables for the mining plan

Table note: for surrounding land parcels, approach roads or new land being added to the lease, see when you need land survey services.

Rates for lease boundary work

Each lease is quoted from a few standard items, depending on size and scope.

• DGPS control and boundary pillars: ₹3,000 per point.
• Topographic survey of the lease: ₹4,000 per acre for the first 10 acres, then ₹2,500 for each further acre (₹15,000 minimum).
• Drone survey with orthomosaic and contours: from ₹40,000 per site up to 25 acres, then ₹1,500 per extra acre.
• Drone LiDAR with point cloud and terrain model: ₹2,500 per acre, minimum ₹1,50,000.
• Record-based demarcation with revenue papers: priced after seeing the papers.

Rates exclude GST, and the written quote fixes the total. Leases in Delhi NCR get a crew the same day or within 1 working day, but most lie elsewhere. Each is handled by a team member based in that mining district, who starts immediately or within 1 working day, with any travel cost that applies shown in the quote. Drawings follow within about three working days; drone processing on large leases follows the agreed programme.

Mezux Touch is an independent survey contractor for lessees and their QPs, with no appointment from the Indian Bureau of Mines or any state mining department. To plan your survey, get a price for this work with the lease sketch and the village map.

Frequently asked questions

Can you prepare the mining plan itself?

No, the mining plan is prepared and signed by the Qualified Person under the rules. We provide the survey data and drawings it needs.

What if a boundary pillar is missing?

We record it as missing and observe its certified position. Re-erection follows the direction of the competent authority.

Which coordinate formats do you supply?

WGS-84 latitude and longitude in degrees, minutes and seconds, decimal degrees if needed, and UTM eastings and northings in the correct zone.

How are drone results delivered?

As an orthomosaic, a surface model and contours; see GPR survey deliverables for how utility scan layers are added to the same drawing.

Can you survey a lease in hilly or forested terrain?

Yes, static DGPS on open points, a total station survey into covered areas and drone LiDAR where vegetation hides the ground.

Do you do annual repeat surveys?

Yes, using the same control network so that each year's drawing compares directly with the last.

Written by Saniya Parveen · Technically reviewed by Rahul Rai · Updated 8 November 2026