Ore Visual Detector
This is a standalone mod primarily based on Detrav Scanner Mod (a GT5U scanner addon).
Simply right-click to activate scanning of all ores in the surrounding area. The results will be displayed in a convenient graphical interface.

The mod offers flexible customization: you can set custom colors for different ore types and add new blocks to the scanning list.
For configuration, open the file config\OreVisualDetector\CustomOreColorMap.json:
{
"OreDict": "ore dictionary name",
"R": color,
"G": color,
"B": color
}
or
{
"Unlocalized": "unlocalized block name",
"R": color,
"G": color,
"B": color
}