What Is Gilsonite? (Also Known as Uintahite or Asphaltum)
Gilsonite is a naturally produced, bitumen-impregnated rock — technically classified as an asphaltite — that occurs in vertical veins deep underground. It is also referred to as natural bitumen, natural asphalt, Uintahite, or Asphaltum, depending on the region and industry. In appearance, it resembles shiny black obsidian, but it is brittle and easily crushed into a fine, dark brown powder.
Because of its natural compatibility with petroleum-based products, Gilsonite is widely used to harden and stabilize softer asphalts and resins. It dissolves readily in aromatic and aliphatic solvents, which is one of the key properties that makes it so versatile across industries — from oil and gas to paint, ink, and construction.
A Brief History of Gilsonite
Gilsonite was first discovered in the early 1860s. It gained commercial significance around the mid-1880s, when Samuel H. Gilson began promoting it as a waterproof varnish, an electrical insulator for wire cable, and a protective coating — applications that eventually gave the mineral its name. In 1888, Gilson and a business partner founded the first company to mine and market the resin at scale.
Early Gilsonite was graded into two categories: “Selects,” valued for higher purity and solubility, and “Fines,” which had a higher softening point. Modern extraction and refining methods have largely closed that quality gap, and today Gilsonite is graded primarily by softening point and particle size rather than the older classification system.
Where Gilsonite Comes From: Gilsonite Mines in Iran
Natural Gilsonite deposits run in narrow, near-vertical veins across a belt roughly 100 kilometers long and 50 kilometers wide. While the mineral has been found in a number of countries — including the United States, Iraq, Australia, Russia, and Venezuela — large-scale commercial production is concentrated in only a few locations worldwide.
In Iran, the primary gilsonite mine regions are located in the western and southern provinces, most notably Kermanshah, along with Ilam and Khuzestan. Gilsonite is hand-mined from underground shafts using pneumatic jackhammers, then dried, screened, and sized to customer specification before being shipped to international markets.
Is Gilsonite Safe? Purity and Health Properties
One of Gilsonite’s key advantages over synthetic alternatives is its safety profile. Natural Gilsonite is:
- Non-toxic (unlike coal or fly ash)
- Non-carcinogenic
- Non-mutagenic
- Safe to handle without extreme protective measures
- Compliant with Gulf of Mexico EPA discharge requirements for deep-water drilling operations
This purity comes from its composition — a naturally occurring blend of hydrocarbons rich in nitrogen and beta-carotenes — which also contributes to its performance as an industrial additive.
Gilsonite Product Types
Depending on the application, Gilsonite is supplied in several forms:
- Gilsonite Lump — raw, unprocessed ore with up to 25% ash content
- Granulated Gilsonite — sized to 30–40 mesh, suited for applications requiring controlled particle size
- Micronized Gilsonite Powder — ground to 80–400 mesh for fast dissolution and uniform blending
Each grade can be packed to order in multilayer laminated bags, kraft bags, AD star bags, or 1-metric-ton jumbo bags, depending on shipping and handling requirements.
What Is Gilsonite Used For? Key Industrial Applications
Gilsonite is used in more than 160 products across a wide range of industries. Its main applications include:
Drilling Mud and Fluid Loss Control
In oil and gas drilling, Gilsonite is a widely used additive in drilling mud formulations. It functions as an effective fluid loss control additive, helping stabilize wellbore walls, reduce lost circulation, and improve drilling efficiency in high-temperature, high-pressure formations.
Road Construction and Asphalt Modification
As a natural asphalt, Gilsonite is blended into asphalt cement and hot mix asphalt to improve pavement stability and durability. Because it occurs naturally rather than requiring a refining process, it can be a more cost-effective option than fully processed petroleum asphalt for road construction projects.
Insulation and Protective Coatings
Gilsonite’s high insulating property makes it a strong base for moisture-resistant coatings used across industrial installations, protecting components from corrosion. It is also used in products such as insulation sheeting for construction applications.
Oil and Gas Pipeline Coatings
Beyond drilling mud, Gilsonite is used in protective coatings for oil and gas pipelines, helping reduce corrosion and rust — a major source of maintenance costs across the energy sector.
Ink, Paint, and Foundry Applications
Gilsonite is a common ingredient in dark-colored printing inks and paints, where it improves gloss, drying time, and color depth. In foundry work, it is used as a sand additive to improve casting quality.
Fuel and Coke Production
When processed into coke, Gilsonite’s high carbon content and low ash content make it a viable industrial fuel source for furnace applications.
Why Choose Nikan West as Your Gilsonite Producer
Nikan West Gilsonite Company operates its own gilsonite mine, processing facility, and warehouse in the Gilan-e-Gharb region of Kermanshah Province, Iran, with head offices in Tehran. As a direct gilsonite producer and exporter, we supply:
- Micronized gilsonite powder (80–400 mesh, 0–25% ash content)
- Granulated Gilsonite (30–40 mesh, 0–25% ash content)
- Gilsonite lump (0–25% ash content)
All products are quality-controlled, custom-packed to customer specification, and exported to international markets — particularly across the Middle East — backed by competitive pricing and reliable delivery.
Frequently Asked Questions
What is Gilsonite made of? Gilsonite is a naturally occurring hydrocarbon resin formed from ancient petroleum deposits that hardened underground over millions of years. It requires no chemical refining to be used industrially.
Is Gilsonite the same as natural asphalt? Yes. Gilsonite is commonly referred to as natural asphalt or natural bitumen, and is also known by the names Uintahite and Asphaltum.
What is Gilsonite used for in drilling? In oil and gas drilling, Gilsonite is used as a fluid loss control additive in drilling mud, helping to stabilize the wellbore and reduce fluid loss during drilling operations.
Where does Gilsonite come from? The largest commercial Gilsonite deposits are found in Kermanshah Province, Iran, and in Utah, USA. Iran’s gilsonite mines are concentrated in Kermanshah, Ilam, and Khuzestan provinces.
Is Gilsonite safe to handle? Yes. Gilsonite is non-toxic, non-carcinogenic, and non-mutagenic, and does not require extreme safety precautions during handling.
