There are many ore locations on every map of Monster Hunter World.
Ore are searchable mineral outcrops found throughout the game. These minerals will drop 3 random ore when searched. These ores are then used for crafting. To search a Mineral, run up to the Mineral Crystal that is highlighted and press 
or 
and it will harvest an ore. Do this two more times to harvest another two ore from the same Mineral Crystal.
Each map has a few types of available ore. However, it can drop from any outcrop on that map (slightly random). There are blue and red outcrops which yield different ore. Most Red Outcrops are unavailable on Low Rank (1-5 star assignments). They will spawn on High Rank (6-8 star assignments).
Here are pictures of what a Mineral Crystal looks like in-game:
Ore List:
Locations to Mineral Crystals in Ancient Forest:
Ore you can receive from the Blue Outcrops (Blue Circles) on Low-Rank Missions:
- Machalite Ore
- Iron Ore
- Lightcrystal
Ore you can receive from the Red Outcrops (Red Circles) on Low-Rank Missions:
- Not Available
Ore you can receive from the Blue Outcrops (Blue Circles) on High-Rank Missions:
- Carbalite Ore
- Iron Ore
- Lightcrystal
Ore you can receive from the Red Outcrops (Red Circles) on High-Rank Missions:
- Dragonite Ore
Locations to Mineral Crystals in Wildspire Waste:
Ore you can receive from the Blue Outcrops (Blue Circles) on Low-Rank Missions:
- Earth Crystal
- Iron Ore
- Machalite Ore
Ore you can receive from the Red Outcrops (Red Circles) on Low-Rank Missions:
- Not Available
Ore you can receive from the Blue Outcrops (Blue Circles) on High Rank Missions:
- Carbalite Ore
- Earth Crystal
- Lightcrystal
- Machalite Ore
Ore you can receive from the Red Outcrops (Red Circles) on High Rank Missions:
- Dragonvein Crystal
- Novacrystal
- Spiritecore Ore
Locations to Mineral Crystals in Coral Highlands:
Ore you can receive from the Blue Outcrops (Blue Circles) on Low-Rank Missions:
- Aquacore Ore
- Coral Crystal
- Dragonite Ore
- Iron Ore
- Lightcrystal
- Machalite Ore
Ore you can receive from the Red Outcrops (Red Circles) on Low-Rank Missions:
- Not Available
Ore you can receive from the Blue Outcrops (Blue Circles) on High Rank Missions:
- Aquacore Ore
- Carbalite Ore
- Coral Crystal
- Dragonite Ore
- Lightcrystal
Ore you can receive from the Red Outcrops (Red Circles) on High Rank Missions:
- Dragonvein Crystal
- Dragonite Ore
- Spiritcore Ore
Locations to Mineral Crystals in Rotten Vale:
Ore you can receive from the Blue Outcrops (Blue Circles) on Low-Rank Missions:
- Machalite Ore
- Dragonite Ore
- Iron Ore
Ore you can receive from the Red Outcrops (Red Circles) on Low-Rank Missions:
- Not available
Ore you can receive from the Blue Outcrops (Blue Circles) on High Rank Missions:
- Carbalite Ore
- Dragonite Ore
- Iron Ore
Ore you can receive from the Red Outcrops (Red Circles) on High Rank Missions:
- Dragonvein Crystal
- Dragonite Ore
- Spiritcore Ore
Locations to Mineral Crystals in Elder’s Recess:
Ore you can receive from the Blue Outcrops (Blue Circles) on Low-Rank Missions:
- Carbalite Ore
- Dreamcore Ore
- Firecell Stone
- Fucium Ore
Ore you can receive from the Red Outcrops (Red Circles) on Low-Rank Missions:
- Dragonvein Crystal
- Dragonite Ore
Coral Highlands, Section 9, there are 2 more low level in the southeast corner of the section, your Green Dot is actually really close to 1 of the spots.