Company lists · Data refreshed September 2026

Top 25 Mining compliance consulting firms based in the United States

Name: Mining compliance consulting firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 1,197 companies tracked

RevenueBase identified 1,197 mining compliance consulting firms headquartered in the United States as of September 2026 and tracks 18,283 professional contacts across them, including 7,681 with verified work emails and 7,297 with mobile numbers. Houston is the largest hub.

This list covers mining compliance consulting firms headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 5, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 5, 2026 86% judged on-target in blind review

1,197Companies

18,283Contacts tracked

7,681Verified emails

7,297Mobile numbers

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The 25 largest mining compliance consulting firms based in the United States

Ranked by team size

Top 25 of 1,197 mining compliance consulting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. RevenueBase Smart Search rates how each company's information relates to mining compliance consulting firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Knight Piesold	Strong evidence	Denver, CO, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,231 contacts →
	Strong evidence “Knight Piésold is an employee-owned, global consulting firm providing specialist services to the mining, power, water resources, and infrastructure industries.” Source: RevenueBase Database · checked Sep 5, 2026
2	Barr Engineering CO	Partial evidence	Minneapolis, MN, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,088 contacts →
	Partial evidence “Barr provides engineering and environmental consulting services to clients across the Midwest, throughout the Americas, and around the world.” Source: RevenueBase Database · checked Sep 5, 2026
3	Antea Group USA	Partial evidence	St Paul, MN, United StatesHQ checked Sep 5, 2026	1,001-5,000	658 contacts →
	Partial evidence “Antea Group is an international engineering and environmental consulting firm specializing in full-service solutions in the fields of environment, health and safety, and…” Source: RevenueBase Database · checked Sep 5, 2026
4	Ensafe	Indirect evidence	Memphis, TN, United StatesHQ checked Sep 5, 2026	201-500	463 contacts →
	Indirect evidence “Innovation is not happenstance at EnSafe Inc.” Source: RevenueBase Database · checked Sep 5, 2026
5	GMS Mine Repair & Maintenance	Indirect evidence	Mountain Lake Park, MD, United StatesHQ checked Sep 5, 2026	1,001-5,000	462 contacts →
	Indirect evidence “GMS Mine Repair & Maintenance is the North American leader in underground and surface mine contracting, maintenance and services.” Source: RevenueBase Database · checked Sep 5, 2026
6	All4	Partial evidence	Kimberton, PA, United StatesHQ checked Sep 5, 2026	201-500	331 contacts →
	Partial evidence “ALL4 is a global consulting firm committed to shaping a sustainable future through innovative environmental, health, and safety (EHS) and digital solutions.” Source: RevenueBase Database · checked Sep 5, 2026
7	Ecology And Environment, INC	Indirect evidence	Lancaster, NY, United StatesHQ checked Sep 5, 2026	5,001-10,000	278 contacts →
	Indirect evidence “E&E is now WSP USA.” Source: RevenueBase Database · checked Sep 5, 2026
8	Kleinschmidt Associates	Indirect evidence	Pittsfield, ME, United StatesHQ checked Sep 5, 2026	201-500	218 contacts →
	Indirect evidence “At Kleinschmidt, we work primarily with energy companies and government agencies in North America to protect and enhance the environment without compromising performance.” Source: RevenueBase Database · checked Sep 5, 2026
9	Turner Mining Group	Partial evidence	Bloomington, IN, United StatesHQ checked Sep 5, 2026	201-500	196 contacts →
	Partial evidence “Turner Mining Group is a full-service provider to the mining sector with operations throughout the United States.” Source: RevenueBase Database · checked Sep 5, 2026
10	Terraphase Engineering INC	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 5, 2026	201-500	166 contacts →
	Indirect evidence “Terraphase offers cost-effective solutions to complex environmental and engineering challenges.” Source: RevenueBase Database · checked Sep 5, 2026
11	Ecorp Consulting, INC	Indirect evidence	Rocklin, CA, United StatesHQ checked Sep 5, 2026	51-200	166 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 5, 2026
12	Keramida INC	Partial evidence	Indianapolis, IN, United StatesHQ checked Sep 5, 2026	51-200	152 contacts →
	Partial evidence “Founded in 1988, KERAMIDA is a multidisciplinary Sustainability, EHS & Engineering consulting firm grounded in evidence-based research and development.” Source: RevenueBase Database · checked Sep 5, 2026
13	Mostardi Platt	Indirect evidence	Elmhurst, IL, United StatesHQ checked Sep 5, 2026	51-200	140 contacts →
	Indirect evidence “Since the passage of original environmental legislation nearly four decades ago, both private and public industry have turned to Mostardi Platt for guidance in complying with air…” Source: RevenueBase Database · checked Sep 5, 2026
14	Ensolum, LLC	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 5, 2026	51-200	136 contacts →
	Indirect evidence “OUR MISSION is to combine sustainable environmental solutions with forward-thinking, cost-effective, innovative, and value-added technologies that balance our clients’ economic…” Source: RevenueBase Database · checked Sep 5, 2026
15	Ensero Solutions	Partial evidence	Fort Collins, CO, United StatesHQ checked Sep 5, 2026	51-200	129 contacts →
	Partial evidence “Ensero Solutions is an environmental consulting and remediation business with specific expertise in environmental assessments and permitting solutions, mine water management…” Source: RevenueBase Database · checked Sep 5, 2026
16	CMS Environmental Solutions	Partial evidence	Greenwood Village, CO, United StatesHQ checked Sep 5, 2026	51-200	126 contacts →
	Partial evidence “CMS Environmental Solutions is a stormwater compliance consultant providing NOI permitting, development, dewatering planning, site inspections, and custom stormwater management…” Source: RevenueBase Database · checked Sep 5, 2026
17	SDS Petroleum Consultants	Indirect evidence	Tyler, TX, United StatesHQ checked Sep 5, 2026	51-200	122 contacts →
	Indirect evidence “Welcome to SDS Petroleum Consultants company page In Scott Stovall founded SDS Petroleum Consultants L.L.C.” Source: RevenueBase Database · checked Sep 5, 2026
18	Edge Engineering And Science, LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 5, 2026	51-200	116 contacts →
	Indirect evidence “Edge Engineering & Science, LLC (EDGE) is a privately owned professional services firm headquartered in Houston, Texas.” Source: RevenueBase Database · checked Sep 5, 2026
19	Skelly And Loy, Inc., A Terracon Company	Indirect evidence	Harrisburg, PA, United StatesHQ checked Sep 5, 2026	51-200	108 contacts →
	Indirect evidence “Established in 1969, Skelly and Loy is a privately owned, mid-sized corporation with 6 Mid-Atlantic offices.” Source: RevenueBase Database · checked Sep 5, 2026
20	Techlaw	Partial evidence	Chantilly, VA, United StatesHQ checked Sep 5, 2026	201-500	104 contacts →
	Partial evidence “Established in 1983, TechLaw provides environmental and management consulting services to the public sector nationwide.” Source: RevenueBase Database · checked Sep 5, 2026
21	Hart & Hickman, PC	Partial evidence	Charlotte, NC, United StatesHQ checked Sep 5, 2026	51-200	103 contacts →
	Partial evidence “Hart & Hickman PC provides environmental consulting services to commercial, industrial, and governmental clients throughout the Southeast US.” Source: RevenueBase Database · checked Sep 5, 2026
22	Citadel EHS	Partial evidence	Glendale, CA, United StatesHQ checked Sep 5, 2026	51-200	102 contacts →
	Partial evidence “Founded in 1993, Citadel EHS provides comprehensive environmental, health, safety, and sustainability consulting solutions to meet the needs of both the public and private sectors.” Source: RevenueBase Database · checked Sep 5, 2026
23	CK Associates Environmental Consultants	Partial evidence	Baton Rouge, LA, United StatesHQ checked Sep 5, 2026	51-200	101 contacts →
	Partial evidence “CK Associates is an environmental consulting firm that is fully owned by its employees.” Source: RevenueBase Database · checked Sep 5, 2026
24	Chambers Group, INC	Partial evidence	Costa Mesa, CA, United StatesHQ checked Sep 5, 2026	51-200	98 contacts →
	Partial evidence “Public agencies and businesses have been relying on Chambers Group to keep them in compliance with applicable federal, state, and/or local environmental laws, regulations, and…” Source: RevenueBase Database · checked Sep 5, 2026
25	Yorke Engineering, LLC	Indirect evidence	San Juan Capistrano, CA, United StatesHQ checked Sep 5, 2026	51-200	92 contacts →
	Indirect evidence “Yorke Engineering, LLC (Yorke) was founded in 1996 and specializes in air quality, waste, storm water and industrial hygiene/safety services.” Source: RevenueBase Database · checked Sep 5, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: mining compliance consulting firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names mining compliance consulting firms.
Partial evidence: Its own public description names part of mining compliance consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name mining compliance consulting firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 1,197 mining compliance consulting firms based in the United States

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Mining compliance consulting firms based in the United States at a glance

As of Sep 5, 2026

42.0%Verified-email coverage

39.9%Mobile-number coverage

15.3Average contacts per company

1-10Median size (employees)

4.5%Largest-city concentration · Houston

Sep 5, 2026Page data refreshed

Companies by employee count

1-10

684

11-50

395

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

7,1770–30

47731–60

361–90

390–180

21180+

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among mining compliance consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “mining compliance consulting firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names mining compliance consulting firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among mining compliance consulting firms, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 7,681 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 5, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Mining compliance consulting firms by metro

Mining compliance consulting firms in Houston54

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names mining compliance consulting firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many mining compliance consulting firms are there based in the United States?

RevenueBase identified 1,197 mining compliance consulting firms headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Knight Piesold, headquartered in Denver, tops this list with the largest team on record.

Which city has the most mining compliance consulting firms?

Houston leads with 54 headquartered companies, followed by Denver (20) and New York (17).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 7,681 verified decision-maker contacts tracked across these 1,197 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 5, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.