Company lists · Data refreshed September 2026

Top 25 Subsurface exploration services worldwide

Name: Subsurface exploration services worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 6,514 companies tracked

RevenueBase identified 6,514 subsurface exploration services worldwide as of September 2026 and tracks 105,259 professional contacts across them, including 24,682 with verified work emails. The United States is the largest market and Houston the largest hub.

This list covers subsurface exploration services worldwide, 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 22, 2026. Country and city lists for subsurface exploration services follow the table.

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 22, 2026 86% judged on-target in blind review

6,514Companies

105,259Contacts tracked

24,682Verified emails

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The 25 largest subsurface exploration services worldwide

Ranked by team size

Top 25 of 6,514 subsurface exploration services worldwide, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to subsurface exploration services: 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	Keller	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	5,001-10,000	3,960 contacts →
	Indirect evidence “Every day, people around the world live, work and play on ground prepared by Keller, the world's largest geotechnical specialist contractor.” Source: RevenueBase Database · checked Sep 22, 2026
2	Redpath Mining	Indirect evidence	North Bay, ON, CanadaHQ checked Sep 22, 2026	5,001-10,000	2,043 contacts →
	Indirect evidence “Established in 1962, The Redpath Group is an experienced, full-service solutions provider to the global underground mining industry.” Source: RevenueBase Database · checked Sep 22, 2026
3	Geolog International	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 22, 2026	1,001-5,000	1,685 contacts →
	Indirect evidence “Every year, drilling teams make decisions worth millions of dollars on incomplete information.” Source: RevenueBase Database · checked Sep 22, 2026
4	Major Drilling	Indirect evidence	Moncton, NB, CanadaHQ checked Sep 22, 2026	1,001-5,000	1,447 contacts →
	Indirect evidence “Major Drilling Group International Inc.” Source: RevenueBase Database · checked Sep 22, 2026
5	Shearwater Geoservices	Indirect evidence	Laksevåg, NorwayHQ checked Sep 22, 2026	1,001-5,000	1,031 contacts →
	Indirect evidence “Shearwater is a global marine geoscience and technology business.” Source: RevenueBase Database · checked Sep 22, 2026
6	Capital Limited	Partial evidence	Mauritius, AustriaHQ checked Sep 22, 2026	1,001-5,000	994 contacts →
	Partial evidence “Capital Limited is a leading service provider for the exploration and mining industry.” Source: RevenueBase Database · checked Sep 22, 2026
7	AGR	Partial evidence	Oslo, NorwayHQ checked Sep 22, 2026	501-1,000	768 contacts →
	Partial evidence “AGR – an Aqualis company – is a multidisciplinary consultancy, specialising in drilling & wells, subsurface, marine and subsea solutions, resourcing, technical safety and software…” Source: RevenueBase Database · checked Sep 22, 2026
8	Sercel	Partial evidence	Carquefou, FranceHQ checked Sep 22, 2026	1,001-5,000	761 contacts →
	Partial evidence “From natural resources to earth and infrastructure monitoring, energy transition, and defense, Sercel is a pioneer in measuring and understanding Earth’s subsurface to provide…” Source: RevenueBase Database · checked Sep 22, 2026
9	Kuwait Drilling Co. K.S.C.C	Indirect evidence	East Ahmadi, KuwaitHQ checked Sep 22, 2026	1,001-5,000	697 contacts →
	Indirect evidence “KUWAIT DRILLING CO.” Source: RevenueBase Database · checked Sep 22, 2026
10	Seequent	Partial evidence	Christchurch, New ZealandHQ checked Sep 22, 2026	501-1,000	696 contacts →
	Partial evidence “Seequent, The Bentley Subsurface Company, helps organisations to understand the underground, giving them the confidence to make better decisions faster.” Source: RevenueBase Database · checked Sep 22, 2026
11	African Underground Mining Services	Indirect evidence	GhanaHQ checked Sep 22, 2026	1,001-5,000	690 contacts →
	Indirect evidence “African Underground Mining Services (AUMS) is an industry leader in high-speed development and mining production.” Source: RevenueBase Database · checked Sep 22, 2026
12	Explomin Perforaciones	Indirect evidence	Villa El Salvador, PeruHQ checked Sep 22, 2026	1,001-5,000	645 contacts →
	Indirect evidence “Explomin del Perú S.A.” Source: RevenueBase Database · checked Sep 22, 2026
13	Gardline Limited	Indirect evidence	Great Yarmouth, United KingdomHQ checked Sep 22, 2026	501-1,000	545 contacts →
	Indirect evidence “Gardline is a best-in-class provider of geophysical, geotechnical and environmental marine surveys.” Source: RevenueBase Database · checked Sep 22, 2026
14	Saexploration	Indirect evidence	Houston, TX, United StatesHQ checked Sep 22, 2026	201-500	521 contacts →
	Indirect evidence “SAExploration offers a full range of geophysical ground acquisition services from design, prospecting, drilling, recording and analysis of field quality, as well as mobilization…” Source: RevenueBase Database · checked Sep 22, 2026
15	ARGAS	Indirect evidence	4204 King Fahd Road, Saudi ArabiaHQ checked Sep 22, 2026	1,001-5,000	512 contacts →
	Indirect evidence “ARGAS, since its inception in 1966, was focused on developing Geological and Geophysical field solutions to further explore the earth’s Natural Resources.” Source: RevenueBase Database · checked Sep 22, 2026
16	Geotec	Indirect evidence	Ate, BelgiumHQ checked Sep 22, 2026	1,001-5,000	504 contacts →
	Indirect evidence “Geotec S.A, empresa de perforación perteneciente a Boyles Bros, fue fundado en 1963 posicionándose como una empresa líder en la industria minera peruana.” Source: RevenueBase Database · checked Sep 22, 2026
17	GEO	Indirect evidence	Kgs. Lyngby (copenhagen), DenmarkHQ checked Sep 22, 2026	201-500	468 contacts →
	Indirect evidence “Founded in 1943, Geo is a market leading engineering consultancy company and contractor, specialised within the fields of geotechnical and environmental engineering (geoteknik og…” Source: RevenueBase Database · checked Sep 22, 2026
18	Geo-Technology Associates, Inc. GTA	Indirect evidence	Abingdon, MD, United KingdomHQ checked Sep 22, 2026	501-1,000	460 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 Sep 22, 2026
19	L&t Geostructure	Indirect evidence	Chennai, IndiaHQ checked Sep 22, 2026	501-1,000	458 contacts →
	Indirect evidence “Overview In 2012, L&T acquired a huge fleet of sophisticated foundation equipment and L&T GeoStructure - a unique legal business entity, was formed to focus, capture and build…” Source: RevenueBase Database · checked Sep 22, 2026
20	Foraco International SA	Indirect evidence	Marseille, FranceHQ checked Sep 22, 2026	1,001-5,000	458 contacts →
	Indirect evidence “Foraco International SA (TSX: FAR) is a leading global mineral drilling services company that provides a comprehensive and reliable service offering in mining and water projects.” Source: RevenueBase Database · checked Sep 22, 2026
21	AKD International	Indirect evidence	PanamaHQ checked Sep 22, 2026	201-500	452 contacts →
	Indirect evidence “AKD® International es el Aliado Estratégico de toda Empresa de Minería, Energía y/o Petróleo en Latinoamérica que busca un Experto en Perforación con Gran Amor por lo que hace y…” Source: RevenueBase Database · checked Sep 22, 2026
22	Ninyo & Moore, A Socotec Company	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 22, 2026	501-1,000	449 contacts →
	Indirect evidence “Ninyo & Moore was acquired by SOCOTEC US.” Source: RevenueBase Database · checked Sep 22, 2026
23	Minova	Indirect evidence	Greenwood Village, CO, United StatesHQ checked Sep 22, 2026	1,001-5,000	449 contacts →
	Indirect evidence “Minova is an industry leader of ground support and geotechnical solutions for mining, tunnelling and surface ground engineering projects.” Source: RevenueBase Database · checked Sep 22, 2026
24	Groupe Géotec	Indirect evidence	Quetigny, FranceHQ checked Sep 22, 2026	501-1,000	441 contacts →
	Indirect evidence “Groupe Géotec, bureau d’études en ingénierie géotechnique et environnementale, créé en 1973, conseille l’ensemble des interlocuteurs de l’acte de construire : maîtres d’ouvrage…” Source: RevenueBase Database · checked Sep 22, 2026
25	Groupe ABS	Indirect evidence	Montréal, QC, CanadaHQ checked Sep 22, 2026	501-1,000	441 contacts →
	Indirect evidence “Fondé en 1993 et établi dans onze régions du Québec et en Ontario.” Source: RevenueBase Database · checked Sep 22, 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: subsurface exploration services. 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 subsurface exploration services.
Partial evidence: Its own public description names part of subsurface exploration services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name subsurface exploration services. 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 6,514 subsurface exploration services worldwide

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Subsurface exploration services worldwide at a glance

As of Sep 22, 2026

23.4%Verified-email coverage

16.2Average contacts per company

11-50Median size (employees)

1.2%Largest-city concentration · Houston

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

3,108

11-50

2,154

51-200

862

201-500

229

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 subsurface exploration services, 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.
Coverage: Every country. Country and city lists for subsurface exploration services are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “subsurface exploration services”. 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 subsurface exploration services), 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 subsurface exploration services, and records with no verified work email.
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, 24,682 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 22, 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.

Subsurface exploration services by location

29 lists · largest first

Every Subsurface exploration services list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

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 subsurface exploration services, 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 subsurface exploration services are there worldwide?

RevenueBase identified 6,514 subsurface exploration services worldwide 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?

Keller, headquartered in London, tops this list with the largest team on record.

Which country has the most subsurface exploration services?

The United States leads with 1,039 companies, followed by Canada (376) and Brazil (375). Every subsurface exploration services list by country and city is linked on this page.

Which city has the most subsurface exploration services?

Houston leads with 77 headquartered companies, followed by Calgary (63) and Sao Paulo (56).

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 24,682 verified decision-maker contacts tracked across these 6,514 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 22, 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.