Col. 1 : Main MODS : a number in 4 digit maximum corresponding to a sequential number for entering a new mods in the base. Number 1 was entered in 1973 and number 4567 in 1998.

Col.2. ASS.MODS : number of the other MODS occurring in the vicinity of the main occurrence.

Col. 3 : Quadrangle : Degree of latitude and degree of longitude of the SW corner of the area where the MODS is located.

Col. 4. : Name : name of the MODS , can be repeated if different spelling are commonly used.

Col.5 : Long. : longitude in degrees, minutes, seconds, corresponding to the center of the orebody or workings.

Col.6 : Lat. : latitude in degrees, minutes, seconds

Col. 7 : X : longitude in Lambert coordinates (conical projection)

Col. 8 :Y : latitude in Lambert coordinates (conical projection)

Col. 10 : Type : indicate the status of the described occurrence :

• Occurrence : any visible mineralisation without any significance concerning its economic importance ;
• Prospect : detailed mapping and , surface sampling, or drilling have been performed.
• Mining project : systematic drilling has outlined an economic reserve (indicated or proven) and a prefeasability study has been performed or is scheduled.
• Exploited mine : operating mine
• Ancient mine : abandoned mine or exhausted mine. Prehistoric mining operations

Col.11 : size : 

Col. 12 : Main subst. : main substance : indicate the metal or the mineral of economic interest. If several metals are of economic interest, they are listed in decreasing economic importance.

Col. 13 : Secondary substance : other commodities that may add further value to the ore.

Col. 14 : Morphology : if no description, mean that the mineralisation has no specific orientation or that the geologist has missed the topic when entering the data.

• Disseminated deposit : mineralisation is diffuse in a volume of altered rock without any oriention or with a specific orientation (oriented).
• Lens conformable with bedding : means a lenticular body parrallel to the stratification , as for example massive sulfide deposits.
• Stratiform bed : a mineralized sedimentary layer
• Oriented vein : a vein that has a defined strike in surface outcrop or in an addit.
• Stockwork : a network of cross cutting veins in various directions
• Unoriented vein : a vein that has no specific strike ( ?)
• Pipe : a cylindrical body
• Placer : a detrital mineralized body inherited from the erosion of a primary source . May be quaternary in soft rocks or older in metamorphic rocks.
• Undefined shape : no specific shape can be observed.

Col. 15 :Azimuth : strike of the orebody or mineralized vein indegree increasing from N to East.

Col. 16 : Host rock : the name of the prevailing lithologies from the country rock are indicated.

• V : visited
• S : sampling with the sampling media indicated in bracket ( ) :
• All : alluvium
• So : soil
• Ro : rocks
• Du : dump
• Gr : grab
• Ch : channel
• Pan : pan concentrate
• Gc : geochemistry : the sampling media (code similar to the sampling code) is also indicated in bracket
• OW : old workings
• M : mapping
• GP : geophysical method 
• DR : drilling : type in brackett : p : percussion r : rotary (wire line)

Col.18 : Analysis : contain the main analytical results obtained either on individual samples, either on a wider population of samples or a metric section analysed in drill hole. Generally labelled in % or in ppm or in gr./t for precious metals. In brakets : i.v. means isolated value ; du.aver. means dump average ; gr.aver. means grab average.

Col . 19 : Ressources : this heading contains the main economic data : Total ressource expressed in t or Mt (million of tons)

Col.20 : Hydrothermal : a list of the main alteration minerals follows according to the abreviated list :

• Ab: albitisation
• Am : amphibolitisation
• An : anthophyllite
• Ap : apatite
• Ar : argillisation
• As : arsenopyrite
• Bi : biotitisation
• Ba : baryte
• Ca : carbonatation
• Ch : chloritisation
• CF : Fe chlorite
• Co : cordierite
• Do : dolomite
• Ep : épidotisation
• Fe : ferruginisation
• Fd : feldspathisation
• Fl : fluorite
• FK : K feldspar
• Ga : garnet
• Gr : greisen
• Hé : hématitisation
• Hb : hornblende
• Ka : Kaolinisation
• K/Na : K/Na ratio
• Li : limonitisation
• Ma : magnetite
• Mu : muscovitisation
• Na : albite
• Ph : phlogopite
• Pg : pegmatite
• Pr : propylitisation
• Py : pyritisation
• Q : quartz
• Se : sericitisation
• Si : silicification
• Sp : serpentine
• Su : sulfidation
• Ta : talc alteration
• Tm : tourmaline
• Tr : tremolite
• Wo : wollastonite

Col. 21 :. Geochemistry : main pathfinders elements.

Col.22 : Supergene enrichment : indicate if suspected or if a gossan has been developped on a primary disseminated or massive sulfide mineralisation. Silcrete or calcrete may also be refferred in this topic.

Col. 23 and 24 : Previous model and New model:

Previous model : model referred in the reports labelled according to the following list :

• I : intrusive : I/Fe felsic

• I/Ma mafic
• I/UM Ultramafic I/UM/SZ :Sheared ultramafic
• I/UM/OP Ophiolitic Ultramafic
• I/UM/LC Ultramafic layered complex

• VS : volcano-sedimentary VS/ML : massive lens

• VS/ SD : stratabound disseminated
• VS/ SW : stockwerk
• VS/VP : vein- pipe
• VS/BR : breccia

• S: sedimentary SP paleoplacer

• SD sedimentary -disconformity type
• SCH sedimentary carbonate hosted
• SBS sedimentary black shale or Kupferschieffer type

• HF : hornfels (skarn)

• SZ : shear zone; the following code indicate the major lithological unit crosscut by the shear zone :

• SZ/VS metavolcanic rocks
• SZ/SBS : metasedimentary rocks with black shales enz..

• SZ/I : shear zone associated with intrusive . The intrusive major composition can be further deciphered by adding a petrologic code :

• LE : leucogranite
• GD: granodiorite
• GR : granite
• GB : gabbro
• DI : diorite
• MZ : monzodiorite UM :ultramafic intrusive or sheet ( OP :ophiolitic)

• F : fault : mineralisation trapped in an opening without any evidence of shearing.

• QV : quartz vein should be used as a descriptive code if no data allow the definition of a genetic model for the mineralised veins

• P : porphyry
• E : epithermal
• R : Residual R/VS : residual (supergene concentration of a metal) over a volcanogenic mineralisation

Col.24 : New model : new inferred model according to advise of the assessment team. . .

Col.25 : Incertitude ( ?) Indicate that owing to insufficient descriptive data, the suggested model is very hypothetical.

Col.26 : Ore : indicate if economic, non economic or subeconomic.

Col.27 : Global potential : geologic, inferred or proven reserve according to the reports.

Col.28 . Comment : indications concerning further exploration to fully assess the potential or possible extension (lateral or downdip) of the target. The comment must help the user to better understand the score index .

Col.29 : Score : global score indicating the global potential of the target .

• 1-3 low potential
• 4-6 medium potential
• 6-8 high potential
• 9 very high potential

Col. 31 : Label ?