Dealing with duplicate locations kriging - a method for replacing with a single location taking the mean of the duplicates? (R)

I would like to apply kriging with a set of Heavy metals belgian data.

But I got duplicate location :

length(clean.donnees.Ni@coords) 
[1] 5740
length(unique(clean.donnees.Ni@coords))
[1] 5186

I can apply the sp::zerodist function to remove the duplicated location, but instead I would like to take the mean of those points to keep a better dataset.
Does it exist such method ?

I found this topic about the subject in another forum, but there is still no answer :
spatial statistics - Dealing with duplicate locations kriging - a method for replacing with a single location taking the mean of the duplicates? (R) - Geographic Information Systems Stack Exchange

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