Company lists · Data refreshed August 2026

Top 25 Coal geology consulting firms based in the United States

Name: Coal geology 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 Aug 31, 2026 545 companies tracked

RevenueBase identified 545 coal geology consulting firms headquartered in the United States as of August 2026 and tracks 6,556 professional contacts across them, including 2,476 with verified work emails and 2,764 with mobile numbers. Houston is the largest hub.

This list covers coal geology 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 August 31, 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 RevenueBase Smart Search rating on every row Refreshed Aug 31, 2026 86% judged on-target in blind review

545Companies

6,556Contacts tracked

2,476Verified emails

2,764Mobile numbers

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest coal geology consulting firms based in the United States

Ranked by team size

Top 25 of 545 coal geology consulting firms based in the United States, ranked by team size, largest first. Data refreshed Aug 31, 2026. RevenueBase Smart Search rates how each company's information relates to coal geology 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	Geo-Technology Associates, Inc. GTA	Indirect evidence	Laurel, MD, United States	501-1,000	457 contacts →
	Indirect evidence “Geo-Technology Associates, Inc.(GTA) proudly celebrates more than 40 years of service, backed by a team of 600+ professionals-including geotechnical engineers, environmental…” Source: RevenueBase Database · checked Aug 31, 2026
2	Hillis-Carnes Engineering Associates, INC	Partial evidence	Frederick, MD, United States	201-500	303 contacts →
	Partial evidence “Hillis-Carnes Engineering Associates, Inc.(HCEA) is a Mid-Atlantic based, multi-disciplined consulting engineering firm.” Source: RevenueBase Database · checked Aug 31, 2026
3	Degolyer And Macnaughton	Indirect evidence	Houston, TX, United States	201-500	267 contacts →
	Indirect evidence “Reserves assessments and appraisals • Prospective resources assessments • Unconventional resources assessments • Contingent resources assessments • Reservoir simulation •…” Source: RevenueBase Database · checked Aug 31, 2026
4	Piteau Associates Engineering	Indirect evidence	Tucson, AZ, United States	51-200	139 contacts →
	Indirect evidence “Piteau Associates offers geotechnical, hydrogeological, and water management expertise to the mining, construction, municipal, first nations, and industrial sectors.” Source: RevenueBase Database · checked Aug 31, 2026
5	Petrostrat	Partial evidence	Houston, TX, United States	51-200	137 contacts →
	Partial evidence “PetroStrat is a Stratigraphic Consultancy that provides a comprehensive suite of integrated geological services to the Oil & Gas industry.” Source: RevenueBase Database · checked Aug 31, 2026
6	G2 Consulting Group, LLC	Partial evidence	Ann Arbor, MI, United States	51-200	119 contacts →
	Partial evidence “G2 Consulting Group, LLC is a consulting engineering firm providing geotechnical, geoenvironmental, and construction engineering services.” Source: RevenueBase Database · checked Aug 31, 2026
7	SDS Petroleum Consultants	Indirect evidence	Oklahoma City, OK, United States	51-200	119 contacts →
	Indirect evidence “Welcome to SDS Petroleum Consultants company page In Scott Stovall founded SDS Petroleum Consultants L.L.C.” Source: RevenueBase Database · checked Aug 31, 2026
8	Geo-Logic Associates, INC	Partial evidence	Riverside, CA, United States	201-500	106 contacts →
	Partial evidence “Geo-Logic Associates, Inc.(GLA) is an employee-owned, multidisciplinary consulting firm.” Source: RevenueBase Database · checked Aug 31, 2026
9	Blade Energy Partners	Partial evidence	Houston, TX, United States	51-200	102 contacts →
	Partial evidence “Founded in Blade Energy Partners is an independent consulting company known for overcoming the challenges of complex multidisciplinary projects in the oil, gas, and geothermal…” Source: RevenueBase Database · checked Aug 31, 2026
10	Plaster & Wald Consulting Corp	Partial evidence	Mustang, OK, United States	201-500	91 contacts →
	Partial evidence “Plaster & Wald Consulting Corp has provided engineering and consulting services to the oil & gas industry since 1997.Our supervisors provide technical expertise in well planning…” Source: RevenueBase Database · checked Aug 31, 2026
11	Sdii Global	Indirect evidence	Tampa, FL, United States	51-200	83 contacts →
	Indirect evidence “Sdii Global Corporation (SDII) is an industry-leading forensic engineering and earth sciences firm, recognized by its clients as the foremost source of experts to have as their…” Source: RevenueBase Database · checked Aug 31, 2026
12	Rangefront Mining Services	Indirect evidence	Elko, NV, United States	51-200	79 contacts →
	Indirect evidence “Rangefront exists to serve your mining or exploration project in the most efficient, advanced, and forward-thinking way.” Source: RevenueBase Database · checked Aug 31, 2026
13	A. G. Wassenaar, INC	Partial evidence	Englewood, CO, United States	51-200	74 contacts →
	Partial evidence “Founded in 1972, AGW is a multi-disciplined consulting engineering firm specializing in the geosciences and environmental services.” Source: RevenueBase Database · checked Aug 31, 2026
14	Terra Guidance, LLC	Partial evidence	Englewood, CO, United States	51-200	60 contacts →
	Partial evidence “Terra Guidance provides geological analysis remotely, onsite, and in-house.” Source: RevenueBase Database · checked Aug 31, 2026
15	Giles Engineering Associates, INC	Partial evidence	Orange, CA, United States	51-200	57 contacts →
	Partial evidence “Giles Engineering Associates, Inc.(Giles) is a national consulting engineering firm specializing in geotechnical (soils), environmental, subsurface exploration (drilling), and…” Source: RevenueBase Database · checked Aug 31, 2026
16	Cornerstone Earth Group, INC	Partial evidence	Sunnyvale, CA, United States	51-200	56 contacts →
	Partial evidence “Cornerstone Earth Group integrates geotechnical engineering, environmental services, engineering geology, and construction services into a single, client-focused team to…” Source: RevenueBase Database · checked Aug 31, 2026
17	Engineering Analytics, INC	Indirect evidence	Fort Collins, CO, United States	201-500	56 contacts →
	Indirect evidence Source: RevenueBase Database · checked Aug 31, 2026
18	Contour Engineering, LLC	Partial evidence	Kennesaw, GA, United States	51-200	56 contacts →
	Partial evidence “Founded in Contour Engineering, LLC specializes in geotechnical engineering, environmental/natural resource consulting, special inspection services and construction materials…” Source: RevenueBase Database · checked Aug 31, 2026
19	Lonquist & Co., LLC	Indirect evidence	Austin, TX, United States	51-200	54 contacts →
	Indirect evidence “Petroleum Engineering & Energy Advisors - With the Lonquist team, you have access to some of the most experienced and skilled professionals in the business.” Source: RevenueBase Database · checked Aug 31, 2026
20	Associated Earth Sciences, Inc. Aesi	Strong evidence	Tacoma, WA, United States	51-200	47 contacts →
	Strong evidence “In the early 1980s, geologist Louis Lepp had a vision to start a local geologic/geotechnical engineering consulting company by combining and coordinating several of the…” Source: RevenueBase Database · checked Aug 31, 2026
21	Riner Engineering, Inc., A UES Company	Indirect evidence	Austin, TX, United States	51-200	47 contacts →
	Indirect evidence “Riner Engineering became part of the UES family of companies in June 2023, combining our local expertise with UES’s nationwide presence and resources.” Source: RevenueBase Database · checked Aug 31, 2026
22	Field GEO Services, INC	Indirect evidence	Grand Junction, CO, United States	51-200	47 contacts →
	Indirect evidence Source: RevenueBase Database · checked Aug 31, 2026
23	Geoservices, LLC	Indirect evidence	Cleveland, TN, United States	51-200	40 contacts →
	Indirect evidence “GEOServices, LLC is a geotechnical engineering, materials testing, construction services and environmental services firm.” Source: RevenueBase Database · checked Aug 31, 2026
24	KEY Environmental INC	Strong evidence	Carnegie, PA, United States	51-200	40 contacts →
	Strong evidence “KEY Environmental is a 30-year-old Engineering and Consulting Company, providing Civil, Geotechnical, Chemical, Environmental, and Geological/Hydrogeological Services paired with…” Source: RevenueBase Database · checked Aug 31, 2026
25	Earthres, A Division Of Respec	Partial evidence	Morgantown, WV, United States	51-200	38 contacts →
	Partial evidence “Earthres Group, Inc.(EARTHRES) is a full-service multi-disciplinary engineering and environmental consulting firm providing high-quality services to private and public clients in…” Source: RevenueBase Database · checked Aug 31, 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: coal geology 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 coal geology consulting firms.
Partial evidence: Its own public description names part of coal geology consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name coal geology 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 545 coal geology consulting firms based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 2,476 reachable decision-makers.

Free signup · no credit card

View the full list →

Coal geology consulting firms based in the United States at a glance

As of Aug 31, 2026

37.8%Verified-email coverage

42.2%Mobile-number coverage

12.0Average contacts per company

1-10Median size (employees)

8.8%Largest-city concentration · Houston

Aug 31, 2026Page data refreshed

Companies by employee count

1-10

315

11-50

159

51-200

201-500

501-1,000

1,001-5,000

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 coal geology 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 “coal geology 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 coal geology 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 coal geology 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, 2,476 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 August 31, 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.

Coal geology consulting firms by metro

Coal geology consulting firms in Houston48

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 coal geology 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 coal geology consulting firms are there based in the United States?

RevenueBase identified 545 coal geology consulting firms headquartered in the United States as of August 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?

Geo-Technology Associates, Inc. GTA, headquartered in Laurel, tops this list with the largest team on record.

Which city has the most coal geology consulting firms?

Houston leads with 48 headquartered companies, followed by Denver (16) and Oklahoma City (8).

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 2,476 verified decision-maker contacts tracked across these 545 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on August 31, 2026.

Ready to reach these companies? Verified emails and direct dials for all 545 coal geology consulting firms based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

Coal geology consulting firms by geography

Browse the directory

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.