The types of ore that can be found in a system's asteroid belts are determined by a code called the security class of the system. You can't find out a system's security class directly in-game, but the value is present in the Eve database dumps. In 0.0, you can deduce a system's security class from the region it is in, and the truesec of the system.

The security class is a letter from A to J, optionally followed by a number from 1 to 7. For example, Jita is a class “A” system, and S-U8A4 is class “J2”. Generally, the higher the number, the better the ore.

The security class is most useful in 0.0 regions, since the whole region will have the same letter code, and the following number is then determined by the truesec of the system.

The following table shows the security class letter used for 0.0 regions:

And this table shows the relation between the truesec and the security class number:

For instance, Syndicate has a security class letter of “J”, and S-U8A4, with a truesec of -0.446, thus has a security class of “J2”.

This table shows the abbreviation used for Ore

The actual ores which will spawn are given by this table:

Security class letters A-E are used in empire regions, and systems in the same region may have different letter classes, which makes them less useful.

The range of values found in the game are:

This table shows the system security classes present in each empire region: