---
title: AML and AMD Basics — Start Here
description: "Abandoned mine land and acid mine drainage are two of Pennsylvania's most persistent environmental challenges — and two of the most misunderstood. This category covers the foundations: what AML and AMD are, how they form, what they do to streams…"
url: "https://aml-connect.org/aml-knowledge-base/aml-and-amd-basics-hub/"
updated: "2026-03-24"
category: AML and AMD Basics
---

# AML and AMD Basics — Start Here

Abandoned mine land and acid mine drainage are two of Pennsylvania's most persistent environmental challenges — and two of the most misunderstood. This category covers the foundations: what AML and AMD are, how they form, what they do to streams and communities, and why they matter.

Start here if you are new to AML/AMD, are explaining it to others, or want a solid grounding before exploring technical or policy content.

## **Recommended Reading Order**

| **Article** | **What you'll learn** |
| --- | --- |
| **What is AMD?** | Introduction to acid mine drainage — definition, characteristics, and where it comes from |
| **How AMD is Formed** | The chemistry of pyrite oxidation and how coal mining creates acidic drainage |
| **Impacts of AMD** | What AMD does to streams, aquatic life, water quality, and communities |
| **AMD is Nonpoint Source Pollution (NPS)** | How AMD is regulated and why NPS classification matters for funding and remediation |
| **Mining Methods and AMD** | How different coal mining methods — surface, underground, refuse piles — relate to AMD generation |

## **Related Resources**

- [EPCAMR Acid Mine Drainage Fact Sheet](https://epcamr.org/storage/projects/FactSheets/EPCAMR_Acid_Mine_Drainage.pdf) — plain-language overview for community audiences (Resource Library)
- [PA AML Inventory by Congressional District](https://epcamr.org/storage/projects/FactSheets/Statewide%20AML%20Inventory%2022.pdf) — scale of the problem in PA (Resource Library)
- [EPCAMR What EPCAMR Does Fact Sheet](https://epcamr.org/storage/projects/FactSheets/What-EPCAMR-Does.pdf) — network context for new users (Resource Library)

## **Questions? Ask in the Forums**

Post questions about AML/AMD basics in the General Discussion forum. New to the topic and not sure where to start? Say so — the community is here to help.

| **Source:**AML-Connect / EPCAMR  |  **Last Reviewed:**March 2026  |  **Forum:**/community/forums/general-discussion/ |
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