Aggregate extraction in Chile: permits, requirements and Law 21,800

Short answer: the sand, gravel and stone on your land are not minerals. Article 13 of the Mining Code leaves them out, so nobody can claim a mining concession over them and they belong to the owner of the soil. But owning the material does not authorise you to remove it: extraction requires a municipal permit, and from February 2027 Law 21,800 adds a technical authorisation from the Hydraulic Works Department, financial guarantees, a closure plan, a certificate of origin and prison sentences. The most important point for a landowner is this: the law does not apply only inside the riverbed, it reaches a strip of one hundred metres measured from the flood line, and that strip almost always falls on private land.

The same scene repeats every summer in central and southern Chile. A truck pulls up to the plot, someone offers to buy the gravel from the stream or the sand from the pit a flood left behind, and the deal is closed on a handshake. The owner thinks he is selling something of his own, and as far as the material goes he is right. The problem is everything else.

Why aggregates are not claimed as a mining concession

The first confusion is believing that sand and gravel are minerals and that somebody can register a mining claim over them. They are not, and the rule is explicit. Article 13 of the Mining Code provides that surface clays and the sands, rocks and other materials directly applicable to construction are not considered mineral substances and are therefore not governed by that code.

The practical consequence runs both ways. Nobody can constitute a mining concession over the aggregates on your land or come in to extract them under cover of a mining claim. And aggregates follow the soil: they belong to the landowner, as accessories of the property, and are sold like any other asset of the estate. That is the good news. The bad news is that ownership of the material and authorisation to extract it are two different things, and the second does not come bundled with the first.

Owning the material is not the same as being allowed to remove it

Two situations have to be separated here, because they are treated very differently.

If the material is in a watercourse, in the bed of a river, stream or lake, it is not yours even if your land adjoins it. Riverbeds are national goods for public use, and the permit is granted by the municipality under article 5(c) of the Constitutional Organic Act on Municipalities, which empowers it to grant permits over that class of property. Each municipality has its own by law, its own charges per cubic metre and its own technical report requirement.

If the material is inside your property, in a pit or quarry away from the watercourse, the material is indeed yours. But extraction remains a regulated activity: it needs the corresponding municipal permit, it is subject to the municipal land use plan, and above certain volumes it must go through the Environmental Impact Assessment System.

The thresholds in article 3(i.5) of the system’s regulations are what decide whether a project is assessed, and they are worth having in front of you before signing any contract to sell material.

What changes with Law 21,800

Law 21,800, which regulates the extraction of aggregates and amends the legal bodies it lists, was published in the Official Gazette on 24 February 2026. Its transitory article provides that it enters into force one year after publication and applies to new extraction applications. It therefore governs from February 2027, and the implementing regulation must be issued by supreme decree of the Ministry of Public Works within that same year.

Until now the Hydraulic Works Department only gave technical advice to municipalities that received applications, without granting permits. Under the new law it takes on a role of its own and the procedure is set out in stages.

The hundred metre strip: why this matters even if the pit is on your land

This is the point almost nobody discusses and it changes the reach of the law for a landowner. The law does not regulate only the riverbed. It regulates the watercourse and also a new concept called the adjacent regulation zone, which article 2 defines as the area or strip parallel to and around the riverbed, one hundred metres in width, measured on the ground from the flood line of those watercourses, associated with a flood of a one hundred year return period.

Read that slowly, because it has three layers. The hundred metres are not measured from the bank you see in summer, but from the flood line of a one hundred year return period flood. That line is not marked on any fence: it has to be determined technically. And once determined, the hundred metres inland fall, on most riparian properties, on privately owned land. The pit can be entirely within your property and still be within the scope of the law.

So the practical question stops being legal and becomes topographic: where does that line fall on your land, and how much of your property sits inside the strip. That is exactly the kind of work a georeferenced survey is for. Without that figure there is no way to know whether what you are planning is a simple municipal permit or a full procedure with technical authorisation, guarantees and a closure plan.

The same exercise tells you something else. If your land has a strip tied to a centennial flood, that also says something about the risk attached to the property, which is what we cover in how to tell whether land is in a flood zone before buying it.

The penalties are no longer just a fine

The harshest change in Law 21,800 is not in the permits but in the penalty regime. Previously, the worst case for undocumented extraction was a municipal fine. Now there are administrative infringements and criminal offences as well.

The second row deserves a pause, because it changes who has an interest in the paperwork being right. The penalty for using material of unproven origin falls on the site that consumes it. From 2027, then, no serious contractor will buy gravel without a certificate, and undocumented material simply loses its market. Traceability stops being a formality and becomes the condition for being able to sell at all.

Who answers when somebody else does the extraction

The most common situation we see is this: the owner extracts nothing, he leases the pit to a third party or simply lets him in for a payment per truckload. He assumes the responsibility belongs to whoever operates the machinery.

That is only partly true. The person extracting answers for his operation, but the landowner is exposed through several channels at once. The municipal permit is applied for over a determined property and with the consent of the person entitled to it. The closure plan attaches to the land, not to the truck: the open pit, the unstable slope and the altered watercourse stay on your property once the third party leaves. And if damage appears to a neighbour, a road or a flood defence, the injured party will sue whoever can be identified, and the registered owner is always identifiable.

On top of that, an aggregates operation leaves physical traces that complicate other matters later. A pit that changed the topography can alter the declared area and boundaries, which then requires correcting the area and boundaries before the land can be sold or subdivided.

What to check before letting anyone buy your gravel

This list is reviewed before the first truck comes in, not afterwards.

• Exactly where the material is. Inside the watercourse it is not yours. Outside it, it is, but it may fall inside the hundred metre strip. Without a survey there is no serious answer to this question.
• What the municipal land use plan says. Land use conditions extractive activity, and there are zones where it simply does not apply.
• How much material is to be removed and over what period. That figure decides whether the project enters environmental assessment, and the thresholds are in the table above.
• Who applies for the permit and in whose name. The operator handling the paperwork does not leave you out of it. Ask to see the mayoral decree and, from 2027, the technical authorisation.
• The contract with the third party. It must state who obtains the permits, who answers for damage to third parties, who executes the closure plan and what happens if the authority suspends operations halfway through.
• The state of the property title. If the land is not properly registered or there is a co ownership behind it, no municipality will authorise extraction over it. A title search clears that up before money goes into projects.
• Access easements. The trucks have to get in and out somehow, and if the road crosses another property you need a properly constituted right of way.

If the extraction has already happened

Where the material has already gone, the order of work is different. First we establish what was extracted, from where and under what authorisation, because that determines whether we are looking at an infringement, an offence or nothing at all. Second, we review the physical state of the land: an open pit with no closure plan is a liability that keeps growing. Third, we measure the limitation periods on civil claims against whoever extracted, which are what allow the value of the material and the cost of remediation to be recovered.

Where there is also damage to a neighbour, a road or a flood defence, the discussion moves to a civil claim for damages, and what decides the outcome there is the evidence: the survey before and after, the dispatch notes, the weighbridge tickets and the permits.

Frequently asked questions about aggregate extraction

Can somebody claim a mining concession over the sand on my land?

No. Article 13 of the Mining Code excludes surface clays, sands, rocks and other materials directly applicable to construction. They are not mineral substances for the purposes of that code, so no claim can be constituted over them. If somebody shows you a concession and says he has come for the gravel, that concession does not entitle him to take it.

If the aggregates are mine, can I remove them without asking anyone?

No. Ownership of the material and authorisation to extract it are different things. Extraction is regulated for reasons of watercourse management, risk and environmental impact, and it needs a municipal permit. Taking a few wheelbarrows for your own building work is not the same as opening a pit and selling by the truckload, and it is precisely that difference in scale the authority looks at.

Does Law 21,800 apply if the pit is on my land and not in the river?

It may, and that is the part that surprises almost everyone. The law reaches the watercourse and also the adjacent regulation zone, a strip of one hundred metres measured from the flood line of a one hundred year return period flood. That strip normally falls on private land. If your pit sits inside it, it is within the scope of the law even though the soil is yours. Establishing that requires a survey, not an opinion.

When does it start to apply and what about permits I already hold?

The law was published on 24 February 2026 and enters into force one year after publication, applying to new extraction applications. Extractions already authorised are governed by the rules in force when the permit was granted, but their renewal falls under the new law. It is worth using the remaining time to get the survey, the contract and the property paperwork in order.

What is the certificate of origin and who does it serve?

It is the document that travels with the material and proves it came from an authorised source. It identifies the holder, the authorisation, the georeferenced location, the purchaser and the cubic metres extracted, and it is sent to the Hydraulic Works Department, which keeps a public register. It serves everyone in the chain: without it, the buyer also risks a fine, which is why from 2027 uncertified aggregate becomes unsellable.

Can I lease the pit to a third party and wash my hands of it?

You can lease it, but you cannot wash your hands of it. The permit is applied for over your property, the closure plan attaches to your land, and the open pit stays on your property when the operator leaves. If there is damage to a neighbour or a road, the natural defendant is the registered owner. A well drafted contract allocates those responsibilities and sets guarantees, but that has to be written before, not once the machinery is already inside.

The material is yours, and so is the responsibility

The first thing we do in these cases is work out where we are standing, literally. A georeferenced topographic survey of the property and the watercourse shows which part of the land falls inside the hundred metre strip, how much material there is and what area the operation commits. That plan is what then serves for the municipal permit, for the technical authorisation and, if things go wrong, as evidence in court. The survey is produced by our own team, so there are no separate offices to coordinate.

On that basis comes the rest: the title search to establish who can authorise the extraction, title regularisation where the property is not properly registered, the drafting of the contract with the operator, and a civil claim where extraction has already taken place without a permit or there is damage to repair.

Send us the property tax roll number, the current ownership certificate and a description of where the material is, and we will tell you which permit applies in your case, whether it falls inside the Law 21,800 strip and what should be signed before the first truck comes in. We work in Spanish and in English.